TTS/STT languages and voices for each provider (#281)

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* add testcase

lib/utils/speech-data/stt-assemblyai.js

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+module.exports = [
+  { name: 'Global English', value: 'en' },
+  { name: 'Australian English', value: 'en_au' },
+  { name: 'British English', value: 'en_uk' },
+  { name: 'US English', value: 'en_us' },
+  { name: 'Spanish', value: 'es' },
+  { name: 'French', value: 'fr' },
+  { name: 'German', value: 'de' },
+  { name: 'Italian', value: 'it' },
+  { name: 'Portuguese', value: 'pt' },
+  { name: 'Dutch', value: 'nl' },
+  { name: 'Hindi', value: 'hi' },
+  { name: 'Japanese', value: 'ja' },
+  { name: 'Chinese', value: 'zh' },
+  { name: 'Finnish', value: 'fi' },
+  { name: 'Korean', value: 'ko' },
+  { name: 'Polish', value: 'pl' },
+  { name: 'Russian', value: 'ru' },
+  { name: 'Turkish', value: 'tr' },
+  { name: 'Ukrainian', value: 'uk' },
+  { name: 'Vietnamese', value: 'vi' },
+];