Add support for configuration file

[michalchudziak]

Description

We need to add support for configuration file instead of adding various CLI options.

A react-native-brownfield config can be created in these three ways (ordered by priority):

react-native-brownfield.config.js
react-native-brownfield.config.json
The react-native-brownfield field in package.json

Acceptance criteria

• a readConfiguration function available in cli/helpers directory
• the function in question accepts path to config file as the only argument
• the function returns correctly parsed configuration object