fix: add missing language getter/setter for Throttling and Debouncing LangToolService

Author: andrew-bekhiet-solid

lib/src/implementations/debounce_lang_tool_service.dart

@@ -11,6 +11,14 @@ class DebounceLangToolService extends LanguageCheckService {
   /// A debouncing used to debounce the API calls.
   final Debouncing<Future<Result<List<Mistake>>?>> debouncing;
 
+  @override
+  String get language => baseService.language;
+
+  @override
+  set language(String language) {
+    baseService.language = language;
+  }
+
   /// Creates a new instance of the [DebounceLangToolService] class.
   DebounceLangToolService(
     this.baseService,

lib/src/implementations/throttling_lang_tool_service.dart

@@ -12,6 +12,14 @@ class ThrottlingLangToolService extends LanguageCheckService {
   /// A throttling used to throttle the API calls.
   final Throttling<Future<Result<List<Mistake>>?>> throttling;
 
+  @override
+  String get language => baseService.language;
+
+  @override
+  set language(String language) {
+    baseService.language = language;
+  }
+
   /// Creates a new instance of the [ThrottlingLangToolService] class.
   ThrottlingLangToolService(
     this.baseService,