BREAKING(ini): make IniMap private

[kt3k]

This PR makes IniMap class private.

We didn't find any usage of IniMap. So this PR shouldn't affect any users.

What's changed

IniMap has been removed

Motivation

We didn't find any usage, any feedback to the API, and we decided to remove this API.

Migration

There's no migration path. Let us know if you use this API.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.24%. Comparing base (a0b4103) to head (93d9866).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5351      +/-   ##
==========================================
+ Coverage   95.94%   96.24%   +0.29%     
==========================================
  Files         458      458              
  Lines       37849    37848       -1     
  Branches     5582     5608      +26     
==========================================
+ Hits        36314    36426     +112     
+ Misses       1494     1381     -113     
  Partials       41       41              

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