Add SpeechConfig to generateContent

[ryanwilson]

Also add MultiSpeakerVoiceConig to enable Gemini TTS.

[gemini-code-assist]

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[danger-firebase-ios]

	2 Warnings
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)
⚠️	New public headers were added, did you remember to add them to the umbrella header?

Generated by 🚫 Danger

[ryanwilson]

Example error when trying to use MultiSpeaker with the Live API:

LiveSessionUnexpectedClosureError(underlyingError: FirebaseAILogic.WebSocketClosedError(closeCode: __C.NSURLSessionWebSocketCloseCode, closeReason: "Native Audio Live API only supports single speaker TTS.", underlyingError: nil))