data: scalar: Accept numpy scalars.

[daavoo]

Closes #253

[codecov-commenter]

Codecov Report

Merging #254 (9da0b11) into main (9602d7f) will increase coverage by 0.09%.
The diff coverage is 94.73%.

❗ Current head 9da0b11 differs from pull request most recent head 6fb8dff. Consider uploading reports for the commit 6fb8dff to get more accurate results

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
+ Coverage   90.27%   90.36%   +0.09%     
==========================================
  Files          20       21       +1     
  Lines         699      716      +17     
==========================================
+ Hits          631      647      +16     
- Misses         68       69       +1     

Impacted Files	Coverage Δ
dvclive/data/utils.py	91.66% <91.66%> (ø)
dvclive/data/__init__.py	100.00% <100.00%> (ø)
dvclive/data/scalar.py	97.77% <100.00%> (+0.21%)	⬆️
dvclive/live.py	97.16% <100.00%> (ø)

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