feat: support equality comparison

[nstarman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.78%. Comparing base (f1a1904) to head (f810282).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/coordinax/_src/base/base.py	88.88%	1 Missing ⚠️
src/coordinax/_src/base/base_pos.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
+ Coverage   95.76%   95.78%   +0.02%     
==========================================
  Files          74       74              
  Lines        2833     2847      +14     
==========================================
+ Hits         2713     2727      +14     
  Misses        120      120              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.