Include alias when formatting import-from structs (#5786)

## Summary

When required-imports is set with the syntax from ... import ... as ...,
autofix I002 is failing

## Test Plan

Reuse the same python files as
`crates/ruff/src/rules/isort/mod.rs:required_import` test.

crates/ruff/src/rules/isort/mod.rs

@@ -777,6 +777,35 @@ mod tests {
         Ok(())
     }
 
+    #[test_case(Path::new("comment.py"))]
+    #[test_case(Path::new("docstring.py"))]
+    #[test_case(Path::new("docstring.pyi"))]
+    #[test_case(Path::new("docstring_only.py"))]
+    #[test_case(Path::new("docstring_with_continuation.py"))]
+    #[test_case(Path::new("docstring_with_semicolon.py"))]
+    #[test_case(Path::new("empty.py"))]
+    #[test_case(Path::new("existing_import.py"))]
+    #[test_case(Path::new("multiline_docstring.py"))]
+    #[test_case(Path::new("off.py"))]
+    fn required_import_with_alias(path: &Path) -> Result<()> {
+        let snapshot = format!("required_import_with_alias_{}", path.to_string_lossy());
+        let diagnostics = test_path(
+            Path::new("isort/required_imports").join(path).as_path(),
+            &Settings {
+                src: vec![test_resource_path("fixtures/isort")],
+                isort: super::settings::Settings {
+                    required_imports: BTreeSet::from([
+                        "from __future__ import annotations as _annotations".to_string(),
+                    ]),
+                    ..super::settings::Settings::default()
+                },
+                ..Settings::for_rule(Rule::MissingRequiredImport)
+            },
+        )?;
+        assert_messages!(snapshot, diagnostics);
+        Ok(())
+    }
+
     #[test_case(Path::new("docstring.py"))]
     #[test_case(Path::new("docstring.pyi"))]
     #[test_case(Path::new("docstring_only.py"))]

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_comment.py.snap

@@ -0,0 +1,19 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+comment.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | #!/usr/bin/env python3
+  |  I002
+2 | 
+3 | x = 1
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+1 1 | #!/usr/bin/env python3
+  2 |+from __future__ import annotations as _annotations
+2 3 | 
+3 4 | x = 1
+
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_docstring.py.snap

@@ -0,0 +1,19 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+docstring.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | """Hello, world!"""
+  |  I002
+2 | 
+3 | x = 1
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+1 1 | """Hello, world!"""
+  2 |+from __future__ import annotations as _annotations
+2 3 | 
+3 4 | x = 1
+
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_docstring.pyi.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_docstring_only.py.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_docstring_with_continuation.py.snap

@@ -0,0 +1,17 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+docstring_with_continuation.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | """Hello, world!"""; x = \
+  |  I002
+2 |     1; y = 2
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+1   |-"""Hello, world!"""; x = \
+  1 |+"""Hello, world!"""; from __future__ import annotations as _annotations; x = \
+2 2 |     1; y = 2
+
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_docstring_with_semicolon.py.snap

@@ -0,0 +1,15 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+docstring_with_semicolon.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | """Hello, world!"""; x = 1
+  |  I002
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+1   |-"""Hello, world!"""; x = 1
+  1 |+"""Hello, world!"""; from __future__ import annotations as _annotations; x = 1
+
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_empty.py.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_existing_import.py.snap

@@ -0,0 +1,17 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+existing_import.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | from __future__ import generator_stop
+  |  I002
+2 | import os
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+  1 |+from __future__ import annotations as _annotations
+1 2 | from __future__ import generator_stop
+2 3 | import os
+
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_multiline_docstring.py.snap

@@ -0,0 +1,20 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+multiline_docstring.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | """a
+  |  I002
+2 | b"""
+3 | # b
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+1 1 | """a
+2 2 | b"""
+3 3 | # b
+  4 |+from __future__ import annotations as _annotations
+4 5 | import os
+
+

crates/ruff/src/rules/isort/snapshots/ruff__rules__isort__tests__required_import_with_alias_off.py.snap

@@ -0,0 +1,20 @@
+---
+source: crates/ruff/src/rules/isort/mod.rs
+---
+off.py:1:1: I002 [*] Missing required import: `from __future__ import annotations as _annotations`
+  |
+1 | # isort: off
+  |  I002
+2 | 
+3 | x = 1
+  |
+  = help: Insert required import: `from future import annotations as _annotations`
+
+ℹ Fix
+1 1 | # isort: off
+  2 |+from __future__ import annotations as _annotations
+2 3 | 
+3 4 | x = 1
+4 5 | # isort: on
+
+

crates/ruff_python_ast/src/imports.rs

@@ -85,6 +85,9 @@ impl std::fmt::Display for ImportFrom<'_> {
             write!(f, "{module}")?;
         }
         write!(f, " import {}", self.name.name)?;
+        if let Some(as_name) = self.name.as_name {
+            write!(f, " as {as_name}")?;
+        }
         Ok(())
     }
 }