Backport PR #798 on branch versions/v2.0.x (♻️ refactor: hoist config override machinery into LocalConfigurable)

[meeseeksmachine]

Backport PR #798: ♻️ refactor: hoist config override machinery into LocalConfigurable

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.61%. Comparing base (26f8c18) to head (c273f5c).

Files with missing lines	Patch %	Lines
src/unxt/_src/config.py	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           versions/v2.0.x     #800      +/-   ##
===================================================
+ Coverage            91.98%   95.61%   +3.62%     
===================================================
  Files                   83       53      -30     
  Lines                 3766     2711    -1055     
  Branches               313      154     -159     
===================================================
- Hits                  3464     2592     -872     
+ Misses                 227       84     -143     
+ Partials                75       35      -40     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.