Catalyst integration

[pacifikus]

Closes #112

PR PR in dvc.org: iterative/dvc.org#2748

[daavoo]

Thanks for the contribution @pacifikus !

Just one minor comment regarding loader_key prefix

[daavoo]

Thanks for the contribution @pacifikus !

Just one minor comment regarding loader_key prefix

Forgot to comment that tests should be updated to match the new behavior

[codecov-commenter]

Codecov Report

Merging #139 (a23e42e) into master (3286543) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

❗ Current head a23e42e differs from pull request most recent head 59c88fa. Consider uploading reports for the commit 59c88fa to get more accurate results

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
- Coverage   90.43%   90.28%   -0.15%     
==========================================
  Files          13       13              
  Lines         324      319       -5     
==========================================
- Hits          293      288       -5     
  Misses         31       31              

Impacted Files	Coverage Δ
dvclive/catalyst.py	100.00% <100.00%> (ø)
dvclive/__init__.py

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