feat: return iterable on @ selector

[alaeddine-13]

Do not merge
This PR is only for testing purposes

[codecov]

Codecov Report

Merging #143 (fa3387c) into main (e5a4ed5) will decrease coverage by 12.15%.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##             main     #143       +/-   ##
===========================================
- Coverage   83.75%   71.60%   -12.16%     
===========================================
  Files         108      108               
  Lines        4618     4617        -1     
===========================================
- Hits         3868     3306      -562     
- Misses        750     1311      +561     

Flag	Coverage Δ
docarray	71.60% <66.66%> (-12.16%)	⬇️

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

Impacted Files	Coverage Δ
docarray/array/mixins/traverse.py	42.25% <50.00%> (-52.20%)	⬇️
docarray/array/mixins/find.py	83.82% <100.00%> (-1.48%)	⬇️
docarray/math/distance/paddle.py	0.00% <0.00%> (-66.67%)	⬇️
docarray/array/mixins/embed.py	13.69% <0.00%> (-63.02%)	⬇️
docarray/math/distance/tensorflow.py	0.00% <0.00%> (-61.91%)	⬇️
docarray/array/mixins/plot.py	8.42% <0.00%> (-56.32%)	⬇️
docarray/array/mixins/text.py	50.00% <0.00%> (-50.00%)	⬇️
docarray/math/distance/torch.py	0.00% <0.00%> (-50.00%)	⬇️
docarray/array/storage/memory/find.py	41.81% <0.00%> (-49.10%)	⬇️
... and 34 more

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[JoanFM]

I would suggest then to create an abstract class:

class DocumentIterable(Iterable[Document]):
# The R DocumentArray 
...

class DocumentArray(DocumentIterable):
 # THE RW DOCUMENTARRAY
# DocumentArray implements DocumentIterable and many more things 

that implements all the methods that do not to rely on the uniqueness of IDS. Like this there will be much better clearer of what is what Plus many of the accessors could be shared.

One could say that `Document

[hanxiao]

close due to #239