Add thread.usedInnerWindowIDs to the processed profile format

[mstange]

This is a prerequisite for sharing the frameTable across threads.

In the future we may want to move this to the process (once we have a list of processes) and also use page indexes everywhere instead of inner window IDs, but for now this seems like an easy incremental step forward.

[codecov]

Codecov Report

❌ Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.71%. Comparing base (c3eaddf) to head (02f9971).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/profile-logic/processed-profile-versioning.ts	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5780      +/-   ##
==========================================
- Coverage   85.75%   85.71%   -0.04%     
==========================================
  Files         318      318              
  Lines       31240    31265      +25     
  Branches     8600     8599       -1     
==========================================
+ Hits        26790    26799       +9     
- Misses       4020     4036      +16     
  Partials      430      430              

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