🎨 Simplify schema module handling

[falexwolf]

• Can't import lamindb for instances created without the wetlab schema #366

[github-actions]

🚀 Deployed on https://637cdd368009372b5c3213b3--lamindb-qnwk.netlify.app

[codecov]

Codecov Report

Merging #367 (07fcb18) into main (8bd42bd) will increase coverage by 0.06%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
+ Coverage   88.71%   88.78%   +0.06%     
==========================================
  Files          35       35              
  Lines         833      820      -13     
==========================================
- Hits          739      728      -11     
+ Misses         94       92       -2     

Impacted Files	Coverage Δ
lamindb/_check_versions.py	68.75% <ø> (+0.75%)	⬆️
lamindb/schema/__init__.py	94.11% <92.85%> (-5.89%)	⬇️

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