refactor: use list for DocumentArrayInMemory

[alaeddine-13]

closes: #209

[codecov]

Codecov Report

Merging #239 (e826a52) into main (807bdb1) will decrease coverage by 0.66%.
The diff coverage is 97.59%.

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
- Coverage   85.81%   85.15%   -0.67%     
==========================================
  Files         131      131              
  Lines        5921     6001      +80     
==========================================
+ Hits         5081     5110      +29     
- Misses        840      891      +51     

Flag	Coverage Δ
docarray	85.15% <97.59%> (-0.67%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
docarray/array/storage/base/getsetdel.py	91.30% <50.00%> (-0.74%)	⬇️
docarray/array/storage/memory/getsetdel.py	95.91% <97.29%> (-4.09%)	⬇️
docarray/__init__.py	100.00% <100.00%> (ø)
docarray/array/storage/memory/backend.py	97.50% <100.00%> (+2.50%)	⬆️
docarray/array/storage/memory/seqlike.py	100.00% <100.00%> (ø)
docarray/array/mixins/reduce.py	28.57% <0.00%> (-67.86%)	⬇️
docarray/array/mixins/group.py	61.53% <0.00%> (-25.65%)	⬇️
docarray/array/mixins/content.py	86.15% <0.00%> (-12.31%)	⬇️
docarray/array/mixins/io/pbar.py	88.88% <0.00%> (-11.12%)	⬇️
... and 8 more

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