Add moa and compound annotation

[wxicu]

PR Checklist

• Referenced issue is linked Perturbation metadata annotation #176
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes
Add compound and moa annotation MoaMetaData and CompoundMetaData
Improve CelllineMetaData: add new parameter show for each annotating function to print out only thr given number of unmatched identifiers.

Technical details
Compound annotation: fetch the compound annotation including the first synonym, cid and canonical smiles via pubchempy. query identifiers can be either CID or the name.
moa annotation: fetch moa annotation sourced from clue.io. query id should be the name of the perturbagens. Annotated moa is also filtered on an optional parameter target.
Lookup objects for two new objects are also implemented.

Additional context

[codecov]

Codecov Report

Attention: 149 lines in your changes are missing coverage. Please review.

Comparison is base (7695ed1) 63.99% compared to head (c36dacf) 62.98%.

❗ Current head c36dacf differs from pull request most recent head 7c5c81a. Consider uploading reports for the commit 7c5c81a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
- Coverage   63.99%   62.98%   -1.01%     
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  Files          37       42       +5     
  Lines        4438     4652     +214     
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+ Hits         2840     2930      +90     
- Misses       1598     1722     +124     

Files	Coverage Δ
pertpy/__init__.py	100.00% <100.00%> (ø)
pertpy/metadata/__init__.py	100.00% <100.00%> (ø)
pertpy/plot/__init__.py	100.00% <100.00%> (ø)
pertpy/tools/__init__.py	100.00% <ø> (ø)
pertpy/metadata/_moa.py	79.48% <79.48%> (ø)
pertpy/metadata/_metadata.py	62.50% <62.50%> (ø)
pertpy/metadata/_compound.py	73.91% <73.91%> (ø)
...y/tools/_perturbation_space/_perturbation_space.py	85.79% <40.00%> (-4.89%)	⬇️
pertpy/plot/_metadata.py	30.30% <30.30%> (ø)
pertpy/metadata/_cell_line.py	69.61% <47.82%> (ø)
... and 1 more

[Zethson]

Thank youuu!

1. Could you please always make the "available database" names links? Also to any of the older cell line metadata databases, please
2. All of these show checks seem pretty repetitive. Is there a way to extract this as a helper function? You just need to also parameterize the type of data (protein, [...]), but that's easy.
3. I think that some of the code can be reduced and simplified. It's a bit verbose.

[Zethson]

Could you please check the types of many of your parameters again? I think they could be a bit more general. Maybe Iterable instead of List for some etc.
Also make the behavior clear if None is an option. Sometimes you're not describing that.

[Zethson]

What are you deleting the whole cell line test and where did your new tests go?

We can merge this then!