fix: fork URL and fetch for React Native in web3.js

[steveluscher]

Problem

React Native has a kneecapped URL implementation, and uses a browser-like fetch API. For web3.js to work in React Native we need to supply forks/polyfills.

Summary of Changes

• Create a fork of the URL impl for use in React Native
• Use the same fetch fork as we do for browsers
• Convince the build system to build a React Native bundle.

[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #26604 (ad8ee4b) into master (1165a7f) will decrease coverage by 4.3%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #26604       +/-   ##
===========================================
- Coverage    81.9%    77.5%     -4.4%     
===========================================
  Files         631       41      -590     
  Lines      174252     2374   -171878     
  Branches        0      343      +343     
===========================================
- Hits       142728     1842   -140886     
+ Misses      31524      405    -31119     
- Partials        0      127      +127