Adopt python copier template

[ptsOSL]

Adopt version 4.3.0 of copier template

I also did all of the ruff suggested linting and formatting changes which included:

• Adding ignore comments to our custom exceptions as their names do not comply with the standard ending in Error
• Renamed unit tests so they are all lower case
• Removing redundant set() and list() calls and using literals instead
• Not having classes inherit from object
• Re-Raising new exceptions from original exception
• Many more

[codecov]

Codecov Report

❌ Patch coverage is 98.11321% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.23%. Comparing base (08c86ad) to head (c92300d).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pytac/load_csv.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
+ Coverage   99.11%   99.23%   +0.12%     
==========================================
  Files          12       12              
  Lines         788      781       -7     
==========================================
- Hits          781      775       -6     
+ Misses          7        6       -1     

☔ View full report in Codecov by Sentry.
📢 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.

[MichaelStubbings]

Looking good!