Implement IntoIterator for &QHash, &QList, &QMap, &QSet, and &QVector

[jnbooth]

Users can now do this:

for item in &qlist {
    // etc.
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a87fcb1) to head (06baa3e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1283   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           75        75           
  Lines        12772     12772           
=========================================
  Hits         12772     12772           

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