feat(tts): implement TTS FallbackAdapter with multi-provider support

[gokuljs]

Adds a TTS FallbackAdapter that provides automatic failover between multiple TTS providers. When a TTS provider fails (due to API errors, timeouts, or other issues), the adapter automatically switches to the next available provider, ensuring high availability for voice synthesis.

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[gokuljs]

Closing this PR. The relevant changes are tracked in PR #1022.