feat(init): add --yarn-config-options option

[szymonrybczak]

Summary:

In React Native CI when initialising project all packages are downloaded from local server, recently we introduced Yarn v3, to make Yarn v3 working with local packages we need to pass the server destination inside Yarn config file .yarnrc.yml. In this PR I created an option that accepts key=value format value, which is then passed via yarn config set when installing template packages in /tmp/ directory.

Test Plan:

1. Clone the repository and do all the required steps from the Contributing guide
2. Run this command:

node /path/to/react-native-cli/packages/cli/build/bin.js init --yarn-config-options npmRegistryServer="http://localhost:4873" --verbose

3. You should see in console log from Yarn:

success Set "npmRegistryServer" to "http://localhost:4873".

Checklist

• Documentation is up to date to reflect these changes.
• Follows commit message convention described in CONTRIBUTING.md

[thymikee]

Let's document this