Add generated code for Speech to Text service

[lpatino10]

This PR adds the generated models and service class for Speech to Text.

All unit and integration tests have been updated to reflect the changes, and new ones have been added as necessary as well.

Any manual changes necessary post-generation can be found here.

[codecov-io]

Codecov Report

Merging #857 into develop will decrease coverage by 0.63%.
The diff coverage is 53.54%.

@@              Coverage Diff              @@
##             develop     #857      +/-   ##
=============================================
- Coverage       56.3%   55.67%   -0.64%     
- Complexity      2216     2408     +192     
=============================================
  Files            496      568      +72     
  Lines          12021    13533    +1512     
  Branches         675      715      +40     
=============================================
+ Hits            6768     7534     +766     
- Misses          4861     5600     +739     
- Partials         392      399       +7

Impacted Files	Coverage Δ	Complexity Δ
...eveloper_cloud/speech_to_text/v1/SpeechToText.java	91.69% <ø> (+12.84%)	85 <0> (+28)	⬆️
...r_cloud/text_to_speech/v1/model/Pronunciation.java	50% <ø> (ø)	2 <0> (ø)	⬇️
.../speech_to_text/v1/model/MultipartRecognition.java	0% <0%> (ø)	0 <0> (?)
.../speech_to_text/v1/model/DeleteSessionOptions.java	0% <0%> (ø)	0 <0> (?)
...oud/text_to_speech/v1/model/ListVoicesOptions.java	0% <0%> (ø)	0 <0> (?)
...r_cloud/speech_to_text/v1/model/SpeechSession.java	0% <0%> (-12.5%)	0 <0> (-2)
...loud/speech_to_text/v1/model/CheckJobsOptions.java	0% <0%> (ø)	0 <0> (?)
...r_cloud/speech_to_text/v1/model/SessionStatus.java	0% <0%> (ø)	0 <0> (?)
.../speech_to_text/v1/model/CreateSessionOptions.java	0% <0%> (ø)	0 <0> (?)
...oud/speech_to_text/v1/model/ListModelsOptions.java	0% <0%> (ø)	0 <0> (?)
... and 184 more

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[germanattanasio]

We need to make sure the RecognizeOptions can be share between the REST and the WebSocket endpoints