add auto-fix for E225,226,227,228 (#8136)

## Summary

Introduce auto fix for `E225`,`E226`,`E227`,`E228`. This partially
address #8121.

## Test Plan

Already covered.

crates/ruff_cli/tests/integration_test.rs

@@ -635,8 +635,9 @@ fn nursery_group_selector_preview_enabled() {
     exit_code: 1
     ----- stdout -----
     -:1:1: CPY001 Missing copyright notice at top of file
-    -:1:2: E225 Missing whitespace around operator
+    -:1:2: E225 [*] Missing whitespace around operator
     Found 2 errors.
+    [*] 1 fixable with the `--fix` option.
 
     ----- stderr -----
     warning: The `NURSERY` selector has been deprecated.
@@ -655,8 +656,9 @@ fn preview_enabled_prefix() {
     exit_code: 1
     ----- stdout -----
     -:1:1: E741 Ambiguous variable name: `I`
-    -:1:2: E225 Missing whitespace around operator
+    -:1:2: E225 [*] Missing whitespace around operator
     Found 2 errors.
+    [*] 1 fixable with the `--fix` option.
 
     ----- stderr -----
     "###);
@@ -675,8 +677,9 @@ fn preview_enabled_all() {
     -:1:1: E741 Ambiguous variable name: `I`
     -:1:1: D100 Missing docstring in public module
     -:1:1: CPY001 Missing copyright notice at top of file
-    -:1:2: E225 Missing whitespace around operator
+    -:1:2: E225 [*] Missing whitespace around operator
     Found 4 errors.
+    [*] 1 fixable with the `--fix` option.
 
     ----- stderr -----
     warning: `one-blank-line-before-class` (D203) and `no-blank-line-before-class` (D211) are incompatible. Ignoring `one-blank-line-before-class`.
@@ -695,8 +698,9 @@ fn preview_enabled_direct() {
     success: false
     exit_code: 1
     ----- stdout -----
-    -:1:2: E225 Missing whitespace around operator
+    -:1:2: E225 [*] Missing whitespace around operator
     Found 1 error.
+    [*] 1 fixable with the `--fix` option.
 
     ----- stderr -----
     "###);

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

@@ -1,4 +1,4 @@
-use ruff_diagnostics::{DiagnosticKind, Violation};
+use ruff_diagnostics::{AlwaysFixableViolation, Diagnostic, DiagnosticKind, Edit, Fix};
 use ruff_macros::{derive_message_formats, violation};
 use ruff_python_parser::TokenKind;
 use ruff_text_size::Ranged;
@@ -30,11 +30,15 @@ use crate::rules::pycodestyle::rules::logical_lines::LogicalLine;
 #[violation]
 pub struct MissingWhitespaceAroundOperator;
 
-impl Violation for MissingWhitespaceAroundOperator {
+impl AlwaysFixableViolation for MissingWhitespaceAroundOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Missing whitespace around operator")
     }
+
+    fn fix_title(&self) -> String {
+        format!("Add missing whitespace")
+    }
 }
 
 /// ## What it does
@@ -59,11 +63,15 @@ impl Violation for MissingWhitespaceAroundOperator {
 #[violation]
 pub struct MissingWhitespaceAroundArithmeticOperator;
 
-impl Violation for MissingWhitespaceAroundArithmeticOperator {
+impl AlwaysFixableViolation for MissingWhitespaceAroundArithmeticOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Missing whitespace around arithmetic operator")
     }
+
+    fn fix_title(&self) -> String {
+        format!("Add missing whitespace")
+    }
 }
 
 /// ## What it does
@@ -88,11 +96,15 @@ impl Violation for MissingWhitespaceAroundArithmeticOperator {
 #[violation]
 pub struct MissingWhitespaceAroundBitwiseOrShiftOperator;
 
-impl Violation for MissingWhitespaceAroundBitwiseOrShiftOperator {
+impl AlwaysFixableViolation for MissingWhitespaceAroundBitwiseOrShiftOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Missing whitespace around bitwise or shift operator")
     }
+
+    fn fix_title(&self) -> String {
+        format!("Add missing whitespace")
+    }
 }
 
 /// ## What it does
@@ -117,11 +129,15 @@ impl Violation for MissingWhitespaceAroundBitwiseOrShiftOperator {
 #[violation]
 pub struct MissingWhitespaceAroundModuloOperator;
 
-impl Violation for MissingWhitespaceAroundModuloOperator {
+impl AlwaysFixableViolation for MissingWhitespaceAroundModuloOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Missing whitespace around modulo operator")
     }
+
+    fn fix_title(&self) -> String {
+        format!("Add missing whitespace")
+    }
 }
 
 /// E225, E226, E227, E228
@@ -211,15 +227,35 @@ pub(crate) fn missing_whitespace_around_operator(
 
             match (has_leading_trivia, has_trailing_trivia) {
                 // Operator with trailing but no leading space, enforce consistent spacing.
-                (false, true) |
+                (false, true) => {
+                    let mut diagnostic =
+                        Diagnostic::new(diagnostic_kind_for_operator(kind), token.range());
+                    diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
+                        " ".to_string(),
+                        token.start(),
+                    )));
+                    context.push_diagnostic(diagnostic);
+                }
                 // Operator with leading but no trailing space, enforce consistent spacing.
                 (true, false) => {
-                    context.push(MissingWhitespaceAroundOperator, token.range());
+                    let mut diagnostic =
+                        Diagnostic::new(diagnostic_kind_for_operator(kind), token.range());
+                    diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
+                        " ".to_string(),
+                        token.end(),
+                    )));
+                    context.push_diagnostic(diagnostic);
                 }
                 // Operator with no space, require spaces if it is required by the operator.
                 (false, false) => {
                     if needs_space == NeedsSpace::Yes {
-                        context.push(diagnostic_kind_for_operator(kind), token.range());
+                        let mut diagnostic =
+                            Diagnostic::new(diagnostic_kind_for_operator(kind), token.range());
+                        diagnostic.set_fix(Fix::safe_edits(
+                            Edit::insertion(" ".to_string(), token.start()),
+                            [Edit::insertion(" ".to_string(), token.end())],
+                        ));
+                        context.push_diagnostic(diagnostic);
                     }
                 }
                 (true, true) => {