* feat(oauth): implement OAuth authorization URL and credentials retrieval
- Added OAuthGetAuthorizationUrlRequest and OAuthGetCredentialsRequest models for handling OAuth requests.
- Introduced methods in PluginExecutor for generating OAuth authorization URLs and retrieving OAuth credentials.
- Updated ToolProvider interface to include OAuth methods for authorization URL and credentials handling.
- Refactored PluginInvokeType and related action enums to support OAuth actions.
Harry