fix(android, sdk): passing custom targeting as array of string instead of string

[AbdelhalimAhmed]

Description

When passing customTargeting as Array of string instead of string the app is crashed.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • [x] Yes
• My change supports the following platforms;
  • [x] Android
  • [ ] iOS
• My change includes tests;
  • [ ] e2e tests added or updated in __tests__e2e__
  • [ ] jest tests added or updated in __tests__
• [x] I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • [ ] Yes
  • [x] No

Test Plan

https://developers.google.com/android/reference/com/google/android/gms/ads/admanager/AdManagerAdRequest.Builder#public-admanageradrequest.builder-addcustomtargeting-string-key,-liststring-values

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[CLAassistant]

All committers have signed the CLA.

[wjaykim]

Hi! Thank you for contributing to our repo. Does this change work with iOS, too?

[AbdelhalimAhmed]

yes, works fine

[github-actions[bot]]

Hello 👋, this PR has been opened for more than 2 months with no activity on it.

If you think this is a mistake please comment and ping a maintainer to get this merged ASAP! Thanks for contributing!

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