Symbology refactor and rename

[jodal]

• Move all symbology functionality to biip.symbology.
• Rename Symbology enum to ISOSymbology to distinguish it from GS1Symbology.
• Rename SymbologyIdentifier.symbology attribute to iso_symbology.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bfea4e1) to head (272deae).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #379   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        17    -1     
  Lines         1077      1073    -4     
  Branches       106       106           
=========================================
- Hits          1077      1073    -4     

☔ 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.