feat: Added new fields to facilitate debugging

* Added new field to Speech response proto, to give more information to indicate whether, or not, Biasing was applied (eg. did Biasing application timed out).
* Added request_id to Speech response protos.

PiperOrigin-RevId: 493311906

Source-Link: googleapis/googleapis@c9b244b

Source-Link: googleapis/googleapis-gen@d63ac84
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