feat(storage): support storage.useEmulator, and md5hash metadata on upload

[mikehardy]

Description

Each commit has it's own informative title and notes

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

Turn off your network and run e2e tests with the storage emulator running or
turn off the emulator and try to run e2e tests

Right now those show Android and iOS is using the emulator and it's all working

There are a few platform-specific issues marked FIXME, that need followup with firebase repos

• metadata issues
• permission issues

---

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[codecov]

Codecov Report

Merging #5324 (94f6836) into master (95cdec6) will increase coverage by 6.18%.
The diff coverage is 91.67%.

❗ Current head 94f6836 differs from pull request most recent head b6f6fae. Consider uploading reports for the commit b6f6fae to get more accurate results

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+ Coverage     68.38%   74.56%   +6.18%     
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  Files           189       97      -92     
  Lines          9449     4288    -5161     
  Branches       1411      921     -490     
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- Hits           6461     3197    -3264     
+ Misses         2569     1021    -1548     
+ Partials        419       70     -349     

[mikehardy]

@Salakar not sure what's going on with iOS, it seems like such a simple call but then when you go to fetch references and do things, it tries to go to live storage.

Does it need to be more like functions where at the javascript level we keep track of the emulator host/port and rewrite everything between gs:// and the bucket name before sending it native?