chore: make engine caching opt-in feature

[peri044]

Description

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Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[peri044]

This can be closed I think - #3131

[zewenli98]

It seems when users switch on make_refittable, it still causes the error if some nodes are unsupported.

[peri044]

@narendasan The check is already in main https://github.com/pytorch/TensorRT/blob/main/py/torch_tensorrt/dynamo/_compiler.py#L239-L247

It seems when users switch on make_refittable, it still causes the error if some nodes are unsupported.

@zewenli98 I'll handle that in another PR