Speechlm2 SALM improvements

[pzelasko]

What does this PR do ?

SpeechLM2 improvements:

• SALM ASR eval: choose English/Basic/None text normalizer, remove hardcoded user prompt and make customizable
• Qwen prompt formatter definition + tests
• Ability to filter NeMoMultimodalConversation data by duration
• Very experimental support for token bucket bins estimation and OOMptimizer for speechlm2 SALM
• Fault-tolerant audio loading for NeMoMultimodalConversation
  • helpful when reading corrupted data, especially when you're unlucky and sample an entire mini-batch of corrupted unreadable audio, in which case FallbackDataset re-uses the previous working mini-batch.

Collection: SpeechLM2

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