feat: add watchModeCommandParams to react-native.config.js

[szymonrybczak]

Summary:

Closes #1872

Add watchModeCommandParams to configure run-ios or run-android commands when pressing i or a inside terminal in watch mode.

Test Plan:

1. Clone the repository and do all the required steps from the Contributing guide
2. Edit react-native.config.js inside project to look something like this:

module.exports = {
  project: {
    ios: {
      watchModeCommandParams: ['--mode', 'Release'],
    },
    android: {
      watchModeCommandParams: ['--mode', 'Release'],
    },
  },
};

4. Run this command:

node /path/to/react-native-cli/packages/cli/build/bin.js start

5. Press i inside terminal and the comand npx react-native run-ios --mode Release should be run.
6. Press a inside terminal and the comand npx react-native run-android --mode Release should be run.

[brianangulo]

Thank you!