Speech end-pointing

[greed2411]

To be updated.

[pskrunner14]

Task 1

Implement Speech Endpointing feature in the Decoder class of kaldi-serve core C++ library. Speech Endpointing is the process of deciding when to stop decoding based on trailing silence in the audio.

Relevant links:

1. Online Decoding TCP Server Binary
2. Online Endpoint - Source

Task 2

Add a boolean flag in kaldi-serve proto file that toggles the Speech Endpointing feature (Task 1) in all the RPC methods implemented in the kaldi-serve gRPC server application.