[FIX] Fix mistake in FASTConvLayer and tf reparameterization

[felixdittrich92]

This PR:

• Fix mistake in FASTConvLayer (special thanks to @czczup (FAST author) for finding this mistake)
• Fix tensorflow reparameterization
• Provide new pretrained backbone checkpoints
• Add small test to check that reparam works as expected

Any feedback is welcome 🤗

@odulcy-mindee Please upload the checkpoints before :)

[felixdittrich92]

@odulcy-mindee We should check the shrink_ratio with the latest checkpoint before :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.82%. Comparing base (058b5db) to head (7f33b85).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1506      +/-   ##
==========================================
- Coverage   95.84%   95.82%   -0.02%     
==========================================
  Files         166      166              
  Lines        7649     7646       -3     
==========================================
- Hits         7331     7327       -4     
- Misses        318      319       +1     

Flag	Coverage Δ
unittests	95.82% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[czczup]

This is really great. Thanks for your time and effort!

[odulcy-mindee]

The uploaded checkpoints ;-)

[odulcy-mindee]

Thanks !