Type alias stub for formatter (#5880)

**Summary** This replaces the `todo!()` with a type alias stub in the
formatter. I added the tests from
704eb40108/parser/src/parser.rs (L901-L936)
as ruff python formatter tests.

**Test Plan** None, testing is part of the actual implementation

crates/ruff_python_formatter/src/generated.rs

@@ -361,6 +361,46 @@ impl<'ast> IntoFormat<PyFormatContext<'ast>> for ast::StmtDelete {
     }
 }
 
+impl FormatRule<ast::StmtTypeAlias, PyFormatContext<'_>>
+    for crate::statement::stmt_type_alias::FormatStmtTypeAlias
+{
+    #[inline]
+    fn fmt(
+        &self,
+        node: &ast::StmtTypeAlias,
+        f: &mut Formatter<PyFormatContext<'_>>,
+    ) -> FormatResult<()> {
+        FormatNodeRule::<ast::StmtTypeAlias>::fmt(self, node, f)
+    }
+}
+impl<'ast> AsFormat<PyFormatContext<'ast>> for ast::StmtTypeAlias {
+    type Format<'a> = FormatRefWithRule<
+        'a,
+        ast::StmtTypeAlias,
+        crate::statement::stmt_type_alias::FormatStmtTypeAlias,
+        PyFormatContext<'ast>,
+    >;
+    fn format(&self) -> Self::Format<'_> {
+        FormatRefWithRule::new(
+            self,
+            crate::statement::stmt_type_alias::FormatStmtTypeAlias::default(),
+        )
+    }
+}
+impl<'ast> IntoFormat<PyFormatContext<'ast>> for ast::StmtTypeAlias {
+    type Format = FormatOwnedWithRule<
+        ast::StmtTypeAlias,
+        crate::statement::stmt_type_alias::FormatStmtTypeAlias,
+        PyFormatContext<'ast>,
+    >;
+    fn into_format(self) -> Self::Format {
+        FormatOwnedWithRule::new(
+            self,
+            crate::statement::stmt_type_alias::FormatStmtTypeAlias::default(),
+        )
+    }
+}
+
 impl FormatRule<ast::StmtAssign, PyFormatContext<'_>>
     for crate::statement::stmt_assign::FormatStmtAssign
 {