Create generate.sh scripts for QHash and QMap

[jnbooth]

Like cxx-qt-lib/src/core/qlist/generate.sh, but for QHash and QMap.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (626371a) to head (c99c82c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1244   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           73        73           
  Lines        12612     12612           
=========================================
  Hits         12612     12612           

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[LeonMatthesKDAB]

@jnbooth Thank you for your contributions :)

Please add the generated files to .gitattributes so that they show up as generated in future PRs.

This also seems a bit overkill for qmap, as that only has a single variant at the moment, but will probably come in handy at some point.

[jnbooth]

@LeonMatthesKDAB Oh, right. Okay, I added them to .gitattributes.