feat: add authentication support with APIAuthType and APIAuthModel

- Introduced APIAuthType enum for various authentication methods.
- Created APIAuthModel with basic authentication fields.
- Updated RequestModel to include authType and authData.
- Implemented EditAuthType widget for selecting and managing authentication.
- Enhanced CollectionStateNotifier to handle authentication updates.

:wq

lib/models/request_model.dart

@@ -15,6 +15,8 @@ class RequestModel with _$RequestModel {
     @Default(APIType.rest) APIType apiType,
     @Default("") String name,
     @Default("") String description,
+    @Default(APIAuthType.none) APIAuthType authType,
+    APIAuthModel? authData,
     @JsonKey(includeToJson: false) @Default(0) requestTabIndex,
     HttpRequestModel? httpRequestModel,
     int? responseStatus,