Adds use_repr to model_addition_debugger_context

[RyanMullins]

What does this PR do?

Adds a use_repr: bool option to model_addition_debugger_context to support saving full tensors to disk instead of repr()-ized versions in the JSON file.

Fixes #37983

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@molbap @ArthurZucker

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[ArthurZucker]

LGTM! 🤗

[molbap]

LGTM @RyanMullins , thank you! I left a minor comment, and something valuable would be to update model_debugging_utils.md with the new option (with the large output size disclaimer)

[molbap]

Hey @RyanMullins - this looks good, do you mind running make fixup to suppress the code quality error? Then I can merge :) else let me know and I can push to this branch

[RyanMullins]

Was preparing for and at Google IO today. Will update the PR and send it your way tomorrow.

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