feat: add finetuning analysis scripts

[villekuosmanen]

What this does

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Title	Label
Fixes #[issue]	(🐛 Bug)
Adds new dataset	(🗃️ Dataset)
Optimizes something	(⚡️ Performance)

How it was tested

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• Added test_something in tests/test_stuff.py.
• Added new_feature and checked that training converges with policy X on dataset/environment Y.
• Optimized some_function, it now runs X times faster than previously.

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pytest -sx tests/test_stuff.py::test_something

python lerobot/scripts/train.py --some.option=true

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[imstevenpmwork]

Hello @villekuosmanen , thanks for your contribution! Is this ready for a review? Can you please add the PR description information? Thanks!

[github-actions[bot]]

This PR has been automatically marked as stale because it has not had recent activity (6 months). It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

This PR was closed because it has been stalled for 21 days with no activity. Feel free to reopen if is still relevant, or to ping a collaborator if you have any questions.