Add an optional '--enable-check-profile' to 'tools/clang_tidy'. (flutter/engine#44773)

Example usage:

```shell
$ dart tools/clang_tidy/bin/main.dart --lint-all --enable-check-profile
```

I plan to use this to help triage why clang_tidy takes so long, and if
particular rules are contributing to most of the cost.

engine/src/flutter/tools/clang_tidy/lib/src/command.dart

@@ -141,6 +141,8 @@ class Command {
         '--fix',
         '--format-style=file',
       ],
+      if (options.enableCheckProfile)
+        '--enable-check-profile',
       '--',
     ];
     args.addAll(tidyArgs.split(' '));

engine/src/flutter/tools/clang_tidy/lib/src/options.dart

@@ -36,6 +36,7 @@ class Options {
     this.warningsAsErrors,
     this.shardId,
     this.shardCommandsPaths = const <io.File>[],
+    this.enableCheckProfile = false,
     StringSink? errSink,
   }) : checks = checksArg.isNotEmpty ? '--checks=$checksArg' : null,
        _errSink = errSink ?? io.stderr;
@@ -82,6 +83,7 @@ class Options {
       warningsAsErrors: _platformSpecificWarningsAsErrors(options),
       shardCommandsPaths: shardCommandsPaths,
       shardId: shardId,
+      enableCheckProfile: options['enable-check-profile'] as bool,
     );
   }
 
@@ -194,6 +196,11 @@ class Options {
       help: 'Perform the given checks on the code. Defaults to the empty '
             'string, indicating all checks should be performed.',
       defaultsTo: '',
+    )
+    ..addFlag(
+      'enable-check-profile',
+      help: 'Enable per-check timing profiles and print a report to stderr.',
+      negatable: false,
     );
 
   /// Whether to print a help message and exit.
@@ -232,6 +239,9 @@ class Options {
   /// Whether checks should apply available fix-ups to the working copy.
   final bool fix;
 
+  /// Whether to enable per-check timing profiles and print a report to stderr.
+  final bool enableCheckProfile;
+
   /// If there was a problem with the command line arguments, this string
   /// contains the error message.
   final String? errorMessage;

engine/src/flutter/tools/clang_tidy/test/clang_tidy_test.dart

@@ -128,6 +128,26 @@ Future<int> main(List<String> args) async {
     ));
   });
 
+  test('Accepts --enable-check-profile', () async {
+    final StringBuffer outBuffer = StringBuffer();
+    final StringBuffer errBuffer = StringBuffer();
+    final ClangTidy clangTidy = ClangTidy.fromCommandLine(
+      <String>[
+        '--compile-commands',
+        buildCommands,
+        '--enable-check-profile',
+      ],
+      outSink: outBuffer,
+      errSink: errBuffer,
+    );
+
+    final int result = await clangTidy.run();
+
+    expect(result, equals(0));
+    expect(clangTidy.options.enableCheckProfile, isTrue);
+    print(outBuffer);
+  });
+
   test('shard-id valid', () async {
     _withTempFile('shard-id-valid', (String path) {
       final Options options = Options.fromCommandLine( <String>[