feat: add keyboard service interceptor to prevent default ops execution

[LucasXu0]

Provide a keyboard service interceptor to allow developers to override or inject built-in keyboard operations.

abstract class AppFlowyKeyboardServiceInterceptor {
  /// Intercept insert operation
  Future<bool> interceptInsert(
    TextEditingDeltaInsertion insertion,
    EditorState editorState,
    List<CharacterShortcutEvent> characterShortcutEvents,
  ) async {
    return false;
  }

  /// Intercept delete operation
  Future<bool> interceptDelete(
    TextEditingDeltaDeletion deletion,
    EditorState editorState,
  ) async {
    return false;
  }

  /// Intercept replace operation
  Future<bool> interceptReplace(
    TextEditingDeltaReplacement replacement,
    EditorState editorState,
    List<CharacterShortcutEvent> characterShortcutEvents,
  ) async {
    return false;
  }

  /// Intercept non-text update operation
  Future<bool> interceptNonTextUpdate(
    TextEditingDeltaNonTextUpdate nonTextUpdate,
    EditorState editorState,
    List<CharacterShortcutEvent> characterShortcutEvents,
  ) async {
    return false;
  }

  /// Intercept perform action operation
  Future<bool> interceptPerformAction(
    TextInputAction action,
    EditorState editorState,
  ) async {
    return false;
  }

  /// Intercept floating cursor operation
  Future<bool> interceptFloatingCursor(
    RawFloatingCursorPoint point,
    EditorState editorState,
  ) async {
    return false;
  }
}

[codecov]

Codecov Report

Attention: Patch coverage is 20.58824% with 54 lines in your changes missing coverage. Please review.

Project coverage is 71.97%. Comparing base (ab977f9) to head (1ba2a28).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...tor_component/service/keyboard_service_widget.dart	22.58%	48 Missing ⚠️
...tor/editor_component/service/keyboard_service.dart	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #902      +/-   ##
==========================================
- Coverage   72.18%   71.97%   -0.21%     
==========================================
  Files         317      318       +1     
  Lines       14870    14921      +51     
==========================================
+ Hits        10734    10740       +6     
- Misses       4136     4181      +45     

Flag	Coverage Δ
	71.97% <20.58%> (-0.21%)	⬇️

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