♻️ Refactor handling of unset types in HasType

[ishitajain9717]

In this PR, we make a minor change to make "Auto" as default rather than "None", so as to deal with duplication issues separately

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.97%. Comparing base (112244e) to head (5f68d87).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3851      +/-   ##
==========================================
- Coverage   91.55%   86.97%   -4.58%     
==========================================
  Files          88       88              
  Lines       15747    15838      +91     
==========================================
- Hits        14417    13775     -642     
- Misses       1330     2063     +733     

Files with missing lines	Coverage Δ
lamindb/models/feature.py	93.35% <100.00%> (ø)
lamindb/models/record.py	94.51% <100.00%> (ø)
lamindb/models/schema.py	93.91% <100.00%> (ø)
lamindb/models/sqlrecord.py	92.11% <100.00%> (+0.04%)	⬆️
lamindb/models/ulabel.py	97.58% <100.00%> (ø)

... and 16 files with indirect coverage changes

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[github-actions]

Deployment URL: https://2c3e8594.lamindb.pages.dev

[falexwolf]

Awesome, @ishitajain9717! This is a great solution.

I only have very minor comments. Feel free to merge once they're addressed.