Refactor v1 incompatibility warning

[arkid15r]

Proposed change

Refactor v1 future incompatibility warning based on the users concerns (1, 2)

The changes summary:

• add version.py as a new version value location
• move the warning to deprecations directory
• update the release documentation

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/pin/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've successfully run make check, all checks and tests are green

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e61c6ed) to head (f6b740a).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev     #2100   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          191       192    +1     
  Lines        11549     11551    +2     
  Branches      1736      1736           
=========================================
+ Hits         11549     11551    +2     

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[KJhellico]

LGTM.