chore: prepare v4.0.0-rc.2

[susnux]

• waiting for fix: properly export all public API #1485
• waiting for refactor(headers): use interfaces where possible #1484

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.93%. Comparing base (3a69d62) to head (c18430f).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1486   +/-   ##
=======================================
  Coverage   85.93%   85.93%           
=======================================
  Files          29       29           
  Lines         661      661           
  Branches      193      193           
=======================================
  Hits          568      568           
  Misses         81       81           
  Partials       12       12           

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