feat(ios, android): add FLUID size support

[Almouro]

Description

Support for FLUID size on Android and fix for iOS FLUID size.

I've built onto this PR to make sure we didn't have to set a fixed height to the ads.
We set "width: 100%" and the ads are responsible for setting their own height

Easier to check the whole changes as a whole with whitespace hidden (https://github.com/invertase/react-native-google-mobile-ads/pull/556/files?diff=split&w=1)

Related issues

Android: FLUID size wasn't supported yet on Android. Fixes #120
iOS: FLUID size was taking full device width. Fixes #213

Supercedes / Closes #277

Release Summary

feat: add FLUID size support

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 __tests__e2e__
  • jest tests added or updated in __tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

I've used the example app to test my changes (as well as a client app with actual production banners)

• On iOS: tested on Iphone 15 simulator iOS 17.0
• On Android: tested on
  • Samsung Galaxy A10s Android 10
  • Pixel 8 Android 14

iOS	A10s	Pixel 8

I've also checked the other banners on Android, since they're affected by this change

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[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #556 (19377a8) into main (8dd5b93) will increase coverage by 0.06%.
The diff coverage is 40.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #556      +/-   ##
==========================================
+ Coverage   43.66%   43.72%   +0.06%     
==========================================
  Files          29       30       +1     
  Lines         536      549      +13     
  Branches      147      151       +4     
==========================================
+ Hits          234      240       +6     
- Misses        302      309       +7     

[Almouro]

When using AdManager and passing multiple sizes including FLUID instead of a single size, I realized that it was still not working properly
Added a commit to address that

[mikehardy]

This is quite a chunk of work, thank. you! It all looks reasonable to me

[mikehardy]

🎉 This PR is included in version 13.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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