fix(analytics): allow manual tracking of ad_impression

[mikehardy]

Description

ad_impression events are allowed through by the native SDKs despite being reserved words, and this is the recommended way to track ad impressions on certain platforms per upstream docs

Related issues

Fixes #6307
Supercedes, thus closes #6312

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

Reporting user made change locally and tested it - reserved word passes cleanly through native SDKs and shows up in analytics

---

Think react-native-firebase is great? Please consider supporting the project with any of the below:

• 👉 Star this repo on GitHub ⭐️
• 👉 Follow React Native Firebase and Invertase on Twitter

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
react-native-firebase	✅ Ready (Inspect)	Visit Preview	Jun 17, 2022 at 4:07PM (UTC)

1 Ignored Deployment

Name	Status	Preview	Updated
react-native-firebase-next	⬜️ Ignored (Inspect)		Jun 17, 2022 at 4:07PM (UTC)

[codecov]

Codecov Report

Merging #6314 (a239eee) into main (ee740f8) will not change coverage.
The diff coverage is n/a.

❗ Current head a239eee differs from pull request most recent head fe559ac. Consider uploading reports for the commit fe559ac to get more accurate results

@@            Coverage Diff            @@
##               main    #6314   +/-   ##
=========================================
  Coverage     53.42%   53.42%           
  Complexity      644      644           
=========================================
  Files           208      208           
  Lines         10315    10315           
  Branches       1633     1633           
=========================================
  Hits           5510     5510           
  Misses         4547     4547           
  Partials        258      258