Feature needed: configuration for which PyTorch version to target

[kit1980]

Currently TorchFix tries to follow latest PyTorch main for things like deprecated APIs. This is not ideal for people who want to use a specific release, for example.

So every rule should be annotated for which PyTorch (and also TorchVision and other libraries where applicable) version it applies, and there should be a configuration parameter for TorchFix to pass the version.