feat: onpremise nuance (#220)

Co-authored-by: Quan HL <quanluuhoang8@gmail.com>

src/api/types.ts

@@ -303,6 +303,8 @@ export interface SpeechCredential {
   custom_stt_endpoint: null | string;
   client_id: null | string;
   secret: null | string;
+  nuance_tts_uri: null | string;
+  nuance_stt_uri: null | string;
   tts_api_key: null | string;
   tts_region: null | string;
   stt_api_key: null | string;