Add config property to eas.schema.json

[sjchmiela]

Why

We want users to feel like they're adding something we support.

How

Added config property to build profile level and platform-specific profile properties levels.

Also prettified the file according to my JSON Tools VS Code extension. Let me know if it should be deprettified.

Test Plan

None.

[linear]

ENG-11501 Add `config` to `eas.json` VS Code suggestions

[sjchmiela]

/changelog-entry bug-fix Add missing config property to eas.json schema.

[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

Size Change: -667 B (0%)

Total Size: 51.3 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	51.3 MB	-667 B (0%)

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.02%. Comparing base (b6b22b7) to head (ddb8696).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2248   +/-   ##
=======================================
  Coverage   54.02%   54.02%           
=======================================
  Files         519      519           
  Lines       18935    18935           
  Branches     3798     3798           
=======================================
  Hits        10228    10228           
  Misses       8686     8686           
  Partials       21       21           

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