[speechllm] Replace TextProcessing with PromptFormatter

[pzelasko]

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[pzelasko]

Please check the following two new commits:

• New test for token_to_generate https://github.com/NVIDIA/NeMo/pull/10639/commits/2b24283b93fcf52a2e461a7b1aa95ef197be665f
• Added padding optimization (which changes the test outcome as seen in diff): https://github.com/NVIDIA/NeMo/pull/10639/commits/1946d71e8691356107709e97a828f50d52750e26

We'll leave audio_locator thing for follow up work as discussed offline.