fix(ios, crashlytics): depend on FirebaseCoreExtension

[mikehardy]

Description

Crashlytics uses headers from this extension cocoapod, but it is only brought-in
automatically by Storage and Functions currently. Depend on it directly

Related issues

#6322 (comment)

Release Summary

conventional commit

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

Hoping for user feedback from @brascene if adding this in the podspec works in place of pulling in functions or storage packages just for this workaround

---

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Name	Status	Preview	Updated
react-native-firebase	✅ Ready (Inspect)	Visit Preview	Jun 28, 2022 at 4:47PM (UTC)

1 Ignored Deployment

Name	Status	Preview	Updated
react-native-firebase-next	⬜️ Ignored (Inspect)		Jun 28, 2022 at 4:47PM (UTC)

[codecov]

Codecov Report

Merging #6352 (07c0ffa) into main (f9a5049) will decrease coverage by 46.48%.
The diff coverage is n/a.

❗ Current head 07c0ffa differs from pull request most recent head 1e07836. Consider uploading reports for the commit 1e07836 to get more accurate results

@@             Coverage Diff             @@
##             main    #6352       +/-   ##
===========================================
- Coverage   72.31%   25.84%   -46.47%     
===========================================
  Files         109       97       -12     
  Lines        4655     4289      -366     
  Branches     1048     1048               
===========================================
- Hits         3366     1108     -2258     
- Misses       1211     2581     +1370     
- Partials       78      600      +522