Implement Pydantic grid override definitions

[BrianMichell]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 99.09091% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.64%. Comparing base (c3ba558) to head (e5628b6).
⚠️ Report is 235 commits behind head on main.

Files with missing lines	Patch %	Lines
src/mdio/converters/segy.py	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #820      +/-   ##
==========================================
+ Coverage   85.30%   91.64%   +6.34%     
==========================================
  Files          46      125      +79     
  Lines        2219     7341    +5122     
  Branches      306      438     +132     
==========================================
+ Hits         1893     6728    +4835     
- Misses        281      526     +245     
- Partials       45       87      +42     

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