lora llama 3.1 can accept specified max_seq_len

[akashc1]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
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Please link to any issues this PR addresses. #2202

Changelog

What are the changes made in this PR?

• allow configuring max_seq_len for llama 3.1 lora models from config or CLI

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[pytorch-bot]

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[felipemello1]

thanks for the PR, do you mind updating the docstrings too, so they include the new arg? I think that for 405B the default is wrong, it should be 131k.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.85%. Comparing base (aa8f365) to head (d2f581c).

Additional details and impacted files

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  Files         344      344           
  Lines       20658    20658           
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  Hits         4928     4928           
  Misses      15730    15730           

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