feat: log files in selected directory and add option to replace them

[szymonrybczak]

Summary:

In this PR I added option to replace existing files in the selected directory.
Related #1591

Test Plan:

1. Clone the repository and do all the required steps from the Contributing guide
2. Create a directory hello with few files
3. Run this command:

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

4. Should ask do user want to replace existing files.
5. If yes, it deletes directory.
6. If not, it prints an error.

Checklist

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

[szymonrybczak]

There's a problem with mocking prompts library when running CLI commands, if calling function directly from test - mocking works correctly if calling via runCLI then mocked values are not taken into account.

[szymonrybczak]

CI green, @thymikee mind going through changes?

[thymikee]

this should be the part of the logger.warn so that the connected messages are kept together. In case someone wanted to only inspect "warn"s they wouldn't see relevant data for this message

[szymonrybczak]

CI Green, good to merge!