chore(ai): Add unit tests for Live API

[daymxn]

This PR adds unit tests for the Live API decoding/encoding. Since a lot of the API surface is covered by implicit Encodable (or alternatives) markers, this PR only really addresses the structs that have custom decoding or encoding logic.

Namely, this means VoiceConfig and BidiGenerateContentServerMessage both have had unit tests added. This basically just ensures they encode/decode correctly.

#no-changelog

BLOCKED_BY=#15410

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