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

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* add testcase

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

@@ -0,0 +1,26 @@
+module.exports = [
+  {
+    name: 'English US',
+    value: 'en_US-8khz',
+  },
+  {
+    name: 'English UK',
+    value: 'en_UK-8khz',
+  },
+  {
+    name: 'Spanish',
+    value: 'es_xx-8khz',
+  },
+  {
+    name: 'French',
+    value: 'fr_fr-8khz',
+  },
+  {
+    name: 'Russian',
+    value: 'ru_ru-8khz',
+  },
+  {
+    name: 'Portuguese',
+    value: 'pt_br-8khz',
+  },
+];