(Feature) init coco and via parser with a dict instead of the filepath

[fstroth]

With this PR the filepath argument for the coco and via parser can be a dict. This is usefull if the annotations are not loaded from disk but from an api.
The name of the init parametr filepath was not changed to not break the api.

[codecov]

Codecov Report

Merging #963 (0ad8724) into master (f6d137d) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #963      +/-   ##
==========================================
+ Coverage   85.65%   85.71%   +0.05%     
==========================================
  Files         254      254              
  Lines        5506     5515       +9     
==========================================
+ Hits         4716     4727      +11     
+ Misses        790      788       -2     

Flag	Coverage Δ
unittests	85.71% <100.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
icevision/parsers/coco_parser.py	100.00% <100.00%> (ø)
icevision/parsers/via_parser.py	100.00% <100.00%> (ø)
...ision/engines/lightning/lightning_model_adapter.py	100.00% <0.00%> (ø)
icevision/__init__.py	100.00% <0.00%> (+12.50%)	⬆️

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[ai-fast-track]

With this PR the filepath argument for the coco and via parser can be a dict. This is usefull if the annotations are not loaded from disk but from an api. The name of the init parametr filepath was not changed to not break the api.

Thanks for the PR @fstroth. Is this use-case found in the IceVision Dashboard?