chore: keep github teams, component owners, and README.md in sync

[pichlermarc]

Adds a few scripts to simplify keeping things in sync:

• all component owners from contrib should be contrib-triagers (scripts/sync-contrib-triagers.mjs)
• everyone listed under a role should be a member of said team (scripts/check-membership-status.mjs)
• README.md should be updated based on a common source of truth (scripts/update-members.mjs)

The new source of truth for this repo is .github/members.json.
I'll still have to update scripts/move-to-emeritus.mjs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.23%. Comparing base (986719e) to head (2598e75).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6012   +/-   ##
=======================================
  Coverage   95.22%   95.23%           
=======================================
  Files         311      311           
  Lines        8603     8597    -6     
  Branches     1801     1801           
=======================================
- Hits         8192     8187    -5     
+ Misses        411      410    -1     

see 1 file with indirect coverage changes

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