[Android] Add HTTP cache by default (like iOS)

[Minishlink]

Motivation

On iOS, the cache is enabled by default but it's not the case on Android. This PR adds 10Mo of HTTP cache by default. 10Mo was chosen arbitrarily.

Fixes #16795

Test Plan

I wrote it so there's no breaking change for those already using the OkHttpClientProvider.createClient and OkHttpClientProvider.createClientBuilder public methods.

1. react-native init TestAndroidCache
2. Followed https://facebook.github.io/react-native/docs/android-building-from-source.html to build with this branch as react-native
3. Added the following code in the App.js (with correct URL_WITH_CACHE_CONTROL)
4. Made sure the debugger is closed
5. Throttled my mac's network speed with the Network link conditioner (edge)
6. Tapped "Fetch", it shows ~4000
7. Tapped "Fetch" again, it shows ~6

import React, { Component } from 'react';
import {
  StyleSheet,
  Alert,
  View,
  Button
} from 'react-native';

type Props = {};
export default class App extends Component<Props> {
  fetch = () => {
    const start = Date.now();
    fetch('{URL_WITH_CACHE_CONTROL}').then(() => {
      const diff = Date.now() - start;
      Alert.alert(diff.toString());
    });
  };

  render() {
    return (
      <View style={styles.container}>
        <Button title={"fetch"} onPress={this.fetch} />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
});

Related PRs

None

Release Notes

[ANDROID] [FEATURE] [Networking] Add HTTP caching

[Minishlink]

cc @hramos as you reviewed recent PRs about networking ;)

[facebook-github-bot]

@Minishlink I tried to find reviewers for this pull request and wanted to ping them to take another look. However, based on the blame information for the files in this pull request I couldn't find any reviewers. This sometimes happens when the files in the pull request are new or don't exist on master anymore. Is this pull request still relevant? If yes could you please rebase? In case you know who has context on this code feel free to mention them in a comment (one person is fine). Thanks for reading and hope you will continue contributing to the project.

[dulmandakh]

Could you please make cache size to be configurable from manifest or gradle scripts.

[facebook-github-bot]

@hramos is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[Minishlink]

@hramos OKHTTP docs say these are bytes, I may be wrong but I think the unit should then be MB (megabytes) or Mo (megaoctets), as Mb stands for megabits

[facebook-github-bot]

@hramos is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

@Minishlink merged commit cf85d0e into facebook:master.