✨ making flask_cors & kaleido optional

[jvdd]

Closes #125

[codecov-commenter]

Codecov Report

Merging #177 (b52a3c0) into main (80f8a06) will decrease coverage by 0.21%.
The diff coverage is 72.72%.

❗ Current head b52a3c0 differs from pull request most recent head 7fbbc35. Consider uploading reports for the commit 7fbbc35 to get more accurate results

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@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
- Coverage   97.31%   97.11%   -0.21%     
==========================================
  Files          12       12              
  Lines         894      900       +6     
==========================================
+ Hits          870      874       +4     
- Misses         24       26       +2     

Impacted Files	Coverage Δ
...tly_resampler/figure_resampler/figure_resampler.py	89.16% <72.72%> (-1.19%)	⬇️

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[jvdd]

Poetry picks 0.2.1.post1 for kaleido, however this version is only for arm32 - plotly/Kaleido#156

Locking kaleido to 0.2.1 until a new version is released (which is imo totally fine as it is now just an optionally dependency)