add auto-fix for E252 (#8142)

## Summary

Introduce auto fix for `E252`. This partially address #8121.

## Test Plan

Already covered.

crates/ruff_linter/src/rules/pycodestyle/rules/logical_lines/whitespace_around_named_parameter_equals.rs

@@ -1,4 +1,4 @@
-use ruff_diagnostics::Violation;
+use ruff_diagnostics::{AlwaysFixableViolation, Diagnostic, Edit, Fix, Violation};
 use ruff_macros::{derive_message_formats, violation};
 use ruff_python_parser::TokenKind;
 use ruff_text_size::{Ranged, TextRange, TextSize};
@@ -69,11 +69,15 @@ impl Violation for UnexpectedSpacesAroundKeywordParameterEquals {
 #[violation]
 pub struct MissingWhitespaceAroundParameterEquals;
 
-impl Violation for MissingWhitespaceAroundParameterEquals {
+impl AlwaysFixableViolation for MissingWhitespaceAroundParameterEquals {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Missing whitespace around parameter equals")
     }
+
+    fn fix_title(&self) -> String {
+        format!("Add missing whitespace")
+    }
 }
 
 fn is_in_def(tokens: &[LogicalLineToken]) -> bool {
@@ -131,7 +135,13 @@ pub(crate) fn whitespace_around_named_parameter_equals(
                 if annotated_func_arg && parens == 1 {
                     let start = token.start();
                     if start == prev_end && prev_end != TextSize::new(0) {
-                        context.push(MissingWhitespaceAroundParameterEquals, token.range());
+                        let mut diagnostic =
+                            Diagnostic::new(MissingWhitespaceAroundParameterEquals, token.range);
+                        diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
+                            " ".to_string(),
+                            token.start(),
+                        )));
+                        context.push_diagnostic(diagnostic);
                     }
 
                     while let Some(next) = iter.peek() {
@@ -141,7 +151,15 @@ pub(crate) fn whitespace_around_named_parameter_equals(
                             let next_start = next.start();
 
                             if next_start == token.end() {
-                                context.push(MissingWhitespaceAroundParameterEquals, token.range());
+                                let mut diagnostic = Diagnostic::new(
+                                    MissingWhitespaceAroundParameterEquals,
+                                    token.range,
+                                );
+                                diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
+                                    " ".to_string(),
+                                    token.end(),
+                                )));
+                                context.push_diagnostic(diagnostic);
                             }
                             break;
                         }

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__E252_E25.py.snap

@@ -1,7 +1,7 @@
 ---
 source: crates/ruff_linter/src/rules/pycodestyle/mod.rs
 ---
-E25.py:46:15: E252 Missing whitespace around parameter equals
+E25.py:46:15: E252 [*] Missing whitespace around parameter equals
    |
 44 |     return a + b
 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
@@ -10,8 +10,19 @@ E25.py:46:15: E252 Missing whitespace around parameter equals
 47 |     return a + b + c
 48 | #: Okay
    |
+   = help: Add missing whitespace
 
-E25.py:46:15: E252 Missing whitespace around parameter equals
+ℹ Fix
+43 43 | async  def add(a: int = 0, b: int = 0) -> int:
+44 44 |     return a + b
+45 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
+46    |-def add(a: int=0, b: int =0, c: int= 0) -> int:
+   46 |+def add(a: int =0, b: int =0, c: int= 0) -> int:
+47 47 |     return a + b + c
+48 48 | #: Okay
+49 49 | def add(a: int = _default(name='f')):
+
+E25.py:46:15: E252 [*] Missing whitespace around parameter equals
    |
 44 |     return a + b
 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
@@ -20,8 +31,19 @@ E25.py:46:15: E252 Missing whitespace around parameter equals
 47 |     return a + b + c
 48 | #: Okay
    |
+   = help: Add missing whitespace
+
+ℹ Fix
+43 43 | async  def add(a: int = 0, b: int = 0) -> int:
+44 44 |     return a + b
+45 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
+46    |-def add(a: int=0, b: int =0, c: int= 0) -> int:
+   46 |+def add(a: int= 0, b: int =0, c: int= 0) -> int:
+47 47 |     return a + b + c
+48 48 | #: Okay
+49 49 | def add(a: int = _default(name='f')):
 
-E25.py:46:26: E252 Missing whitespace around parameter equals
+E25.py:46:26: E252 [*] Missing whitespace around parameter equals
    |
 44 |     return a + b
 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
@@ -30,8 +52,19 @@ E25.py:46:26: E252 Missing whitespace around parameter equals
 47 |     return a + b + c
 48 | #: Okay
    |
+   = help: Add missing whitespace
 
-E25.py:46:36: E252 Missing whitespace around parameter equals
+ℹ Fix
+43 43 | async  def add(a: int = 0, b: int = 0) -> int:
+44 44 |     return a + b
+45 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
+46    |-def add(a: int=0, b: int =0, c: int= 0) -> int:
+   46 |+def add(a: int=0, b: int = 0, c: int= 0) -> int:
+47 47 |     return a + b + c
+48 48 | #: Okay
+49 49 | def add(a: int = _default(name='f')):
+
+E25.py:46:36: E252 [*] Missing whitespace around parameter equals
    |
 44 |     return a + b
 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
@@ -40,5 +73,16 @@ E25.py:46:36: E252 Missing whitespace around parameter equals
 47 |     return a + b + c
 48 | #: Okay
    |
+   = help: Add missing whitespace
+
+ℹ Fix
+43 43 | async  def add(a: int = 0, b: int = 0) -> int:
+44 44 |     return a + b
+45 45 | #: E252:1:15 E252:1:16 E252:1:27 E252:1:36
+46    |-def add(a: int=0, b: int =0, c: int= 0) -> int:
+   46 |+def add(a: int=0, b: int =0, c: int = 0) -> int:
+47 47 |     return a + b + c
+48 48 | #: Okay
+49 49 | def add(a: int = _default(name='f')):