feat: nvidia tts/stt speech (#201)

* feat: nvidia tts/stt speech

* fix: rename riva server uri

* fix: review comments

* fix: review comments

* sort vendors in alphabetic order

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Co-authored-by: Quan HL <quanluuhoang8@gmail.com>
Co-authored-by: Dave Horton <daveh@beachdognet.com>

src/api/types.ts

@@ -307,6 +307,7 @@ export interface SpeechCredential {
   stt_api_key: null | string;
   stt_region: null | string;
   instance_id: null | string;
+  riva_server_uri: null | string;
 }
 
 export interface Alert {