Torch-Tensorrt Integration with LightningModule

[GdoongMathew]

What does this PR do?

Fixes #11438

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📚 Documentation preview 📚: https://pytorch-lightning--20808.org.readthedocs.build/en/20808/

[GdoongMathew]

Hi @Borda , friendly ping for a code review~

btw, I'm wondering if anyone could help me with the unittests during the ci, since there's compatibility problem when testing with the oldest torch 2.1.2 and torch-tensorrt. I'd love to help with solving this problem if there's any suggestion.

[Borda]

since there's compatibility problem when testing with the oldest torch 2.1.2 and torch-tensorrt

I think it is fine to test for recent versions, meaning we can skip it, for example, for PT <=2.4 and add a todo note...

[Borda]

Here, you can also raise an exception for some older PT versions if desired

[GdoongMathew]

Thanks for the suggestion!! I've added it in 15f1961