Allow v1/v2 independent import of torchvision.transforms

[liopeer]

Changes

• adds file lightly/transforms/torchvision_transforms.py with:
  • import v2 of torchvision.transforms if available, else keep using v1
  • add ToTensor() transform that is compatible with v2
• make transforms (irrespective of v1 or v2) available in module lightly.transforms as lightly.transforms.torchvision_transforms

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.88%. Comparing base (fb70eaa) to head (4f3795c). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lightly/transforms/torchvision_transforms.py	70.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1717 +/- ## ========================================== - Coverage 84.90% 84.88% -0.03% ========================================== Files 156 157 +1 Lines 6526 6537 +11 ========================================== + Hits 5541 5549 +8 - Misses 985 988 +3 ```

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