refactor(ini): simplify parse()

[timreichen]

This PR moves all parser functionality from IniMap into the parse() function.
There is a load of unnecessary overhead generated the way parse() works in IniMap.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.32%. Comparing base (f5795f8) to head (a163e78).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6512      +/-   ##
==========================================
+ Coverage   95.08%   95.32%   +0.24%     
==========================================
  Files         576      575       -1     
  Lines       43337    43160     -177     
  Branches     6464     6463       -1     
==========================================
- Hits        41207    41144      -63     
+ Misses       2089     1976     -113     
+ Partials       41       40       -1     

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[kt3k]

LGTM