refactor(ini): remove IniMap

[timreichen]

Depends on #6514 and #6512

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.30%. Comparing base (1853cde) to head (3a48484).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6515   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files         576      576           
  Lines       43199    43201    +2     
  Branches     6466     6466           
=======================================
+ Hits        41171    41173    +2     
  Misses       1989     1989           
  Partials       39       39           

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[kt3k]

LGTM. Nice!

[kt3k]

More context: We used to expose IniMap as public API, which had capability of modifying the ini content while keeping the comments in the original. But we got several feedbacks that IniMap API is too complex and confusing and we decided to remove it during stabilization review in 2024.