[TTS] Condition FastPitch on Energy

[subhankar-ghosh]

What does this PR do ?

Adds support for Conditioning FastPitch model on Energy

Collection: [Note which collection this PR will affect]

nemo/collections/tts/

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[XuesongYang]

Haven't dived too deep for this PR, will do later today. A general question, is there any way we could add a unit test to validate if energy computation and its masking strategy work as expected? We could mock tensors or use real tensors from audio.

[github-actions[bot]]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[subhankar-ghosh]

Breaking due to https://github.com/NVIDIA/NeMo/pull/5176