feat: parallel intra strided-rolling

[jvdd]

Closes #98

• write tests
• profile code
• heuristic for chunk size
  -> additional info: https://stackoverflow.com/questions/3822512/chunksize-parameter-in-multiprocessing-pool-map

[codecov-commenter]

Codecov Report

Merging #102 (17c5a23) into main (00c37eb) will decrease coverage by 0.18%.
The diff coverage is 93.33%.

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@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
- Coverage   97.91%   97.74%   -0.18%     
==========================================
  Files          23       23              
  Lines        1247     1284      +37     
==========================================
+ Hits         1221     1255      +34     
- Misses         26       29       +3     

Impacted Files	Coverage Δ
tsflex/features/segmenter/strided_rolling.py	97.15% <78.57%> (-1.15%)	⬇️
tsflex/features/feature_collection.py	99.56% <97.67%> (+0.04%)	⬆️
tsflex/features/function_wrapper.py	100.00% <100.00%> (ø)
tsflex/features/utils.py	100.00% <100.00%> (ø)

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