Removes separate VISSL caching and adds file_name to torch.hub.load_state_dict_from_url everywhere

[jonasd4]

This PR fixes further issues with torch.hub.load_state_dict_from_url

• In every call to that function, the filename attribute is now set to avoid any unwanted caching.
• The additional caching of vissl models is now removed (previously the assumption was that torch.hub.load_state_dict_from_url does not perform any caching)
• The issue also affected loading the barlowtwins and vicreg models as in their respective hubconf.py also does not set the filename attribute and the filename in the url was the same. (e.g. https://github.com/facebookresearch/barlowtwins/blob/main/hubconf.py). These models are now directly loaded from the respective url while providing the filename attribute in the load function.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.26%. Comparing base (200e047) to head (c087a2a). Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
thingsvision/core/extraction/extractors.py	77.77%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #179 +/- ## ========================================== - Coverage 76.30% 76.26% -0.04% ========================================== Files 40 40 Lines 2055 2056 +1 Branches 262 263 +1 ========================================== Hits 1568 1568 Misses 402 402 - Partials 85 86 +1 ``` | [Flag](https://app.codecov.io/gh/ViCCo-Group/thingsvision/pull/179/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ViCCo-Group) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ViCCo-Group/thingsvision/pull/179/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ViCCo-Group) | `76.26% <77.77%> (-0.04%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ViCCo-Group#carryforward-flags-in-the-pull-request-comment) to find out more.

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[LukasMut]

@jonasd4 Could you provide a meaningful description of the PR? It doesn't have to be long. Can be a one-liner.

[jonasd4]

@jonasd4 LGTM but please add a short description before I approve.

Added the description!