WIP: Modifier Interface Helper

[BradyAJohnston]

Adds a modifier interface helper. Currently you have to use Socket_* identifiers to get and set values from a GN modifier due to RNA limitations. This helper class allows name-based getting and setting.

• initial helper class for modifier access
• satisfy type checking

[codecov]

Codecov Report

❌ Patch coverage is 94.62366% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.91%. Comparing base (5a11433) to head (7815647).

Files with missing lines	Patch %	Lines
databpy/modifier.py	94.25%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   90.53%   90.91%   +0.38%     
==========================================
  Files          13       14       +1     
  Lines         782      870      +88     
==========================================
+ Hits          708      791      +83     
- Misses         74       79       +5     

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