Rename Magic* to IpyEscape* (#6395)

## Summary

This PR renames the `MagicCommand` token to `IpyEscapeCommand` token and
`MagicKind` to `IpyEscapeKind` type to better reflect the purpose of the
token and type. Similarly, it renames the AST nodes from `LineMagic` to
`IpyEscapeCommand` prefixed with `Stmt`/`Expr` wherever necessary.

It also makes renames from using `jupyter_magic` to
`ipython_escape_commands` in various function names.

The mode value is still `Mode::Jupyter` because the escape commands are
part of the IPython syntax but the lexing/parsing is done for a Jupyter
notebook.

### Motivation behind the rename:
* IPython codebase defines it as "EscapeCommand" / "Escape Sequences":
* Escape Sequences:
292e3a2345/IPython/core/inputtransformer2.py (L329-L333)
* Escape command:
292e3a2345/IPython/core/inputtransformer2.py (L410-L411)
* The word "magic" is used mainly for the actual magic commands i.e.,
the ones starting with `%`/`%%`
(https://ipython.readthedocs.io/en/stable/interactive/reference.html#magic-command-system).
So, this avoids any confusion between the Magic token (`%`, `%%`) and
the escape command itself.
## Test Plan

* `cargo test` to make sure all renames are done correctly.
* `grep` for `jupyter_escape`/`magic` to make sure all renames are done
correctly.

crates/ruff_python_formatter/src/statement/mod.rs

@@ -17,7 +17,7 @@ pub(crate) mod stmt_global;
 pub(crate) mod stmt_if;
 pub(crate) mod stmt_import;
 pub(crate) mod stmt_import_from;
-pub(crate) mod stmt_line_magic;
+pub(crate) mod stmt_ipy_escape_command;
 pub(crate) mod stmt_match;
 pub(crate) mod stmt_nonlocal;
 pub(crate) mod stmt_pass;
@@ -61,7 +61,7 @@ impl FormatRule<Stmt, PyFormatContext<'_>> for FormatStmt {
             Stmt::Break(x) => x.format().fmt(f),
             Stmt::Continue(x) => x.format().fmt(f),
             Stmt::TypeAlias(x) => x.format().fmt(f),
-            Stmt::LineMagic(_) => todo!(),
+            Stmt::IpyEscapeCommand(_) => todo!(),
         }
     }
 }

crates/ruff_python_formatter/src/statement/stmt_ipy_escape_command.rs

@@ -0,0 +1,12 @@
+use crate::{verbatim_text, FormatNodeRule, PyFormatter};
+use ruff_formatter::{write, Buffer, FormatResult};
+use ruff_python_ast::StmtIpyEscapeCommand;
+
+#[derive(Default)]
+pub struct FormatStmtIpyEscapeCommand;
+
+impl FormatNodeRule<StmtIpyEscapeCommand> for FormatStmtIpyEscapeCommand {
+    fn fmt_fields(&self, item: &StmtIpyEscapeCommand, f: &mut PyFormatter) -> FormatResult<()> {
+        write!(f, [verbatim_text(item)])
+    }
+}

crates/ruff_python_formatter/src/statement/stmt_line_magic.rs

@@ -1,12 +0,0 @@
-use crate::{verbatim_text, FormatNodeRule, PyFormatter};
-use ruff_formatter::{write, Buffer, FormatResult};
-use ruff_python_ast::StmtLineMagic;
-
-#[derive(Default)]
-pub struct FormatStmtLineMagic;
-
-impl FormatNodeRule<StmtLineMagic> for FormatStmtLineMagic {
-    fn fmt_fields(&self, item: &StmtLineMagic, f: &mut PyFormatter) -> FormatResult<()> {
-        write!(f, [verbatim_text(item)])
-    }
-}