Add rules for datasets and transforms imports

[XIIFulminata]

Context

• There is a linter rule that recommends changing import torchvision.models as models to from torchvision import models
• The same behavior is expected for torchvision.datasets and torchvision.transforms

Changes

• Extend the models rule to also address the first instance of the datasets and transforms imports
• Rename the models import checker and related fixtures to be more generic since more imports are checked now

Testing

• Updated existing unit test and fixture
• No lint errors for modified files

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[kit1980]

Thanks, looks good overall.
Could you also update codemod tests:
https://github.com/pytorch-labs/torchfix/blob/main/tests/fixtures/vision/codemod/models_import.py
https://github.com/pytorch-labs/torchfix/blob/main/tests/fixtures/vision/codemod/models_import.py.out

[kit1980]

LGTM, thanks!