Refactor: monorepo folder structure

[manuraf]

List of Changes

• Set new folder structure following monorepo principles
• Move onboarding-ms and onboarding-functions project under apps/ folder
• Move onboarding-sdk project under libs/ folder
• Align github action to new folder structure

NB. Sorry for PR size but we move entire project under new folders

Motivation and Context

Selfcare-onboarding repo want to follow monorepo principles so it has to follow an appropriate structure of folders. apps/ directory contains now applications and libs/ contains all the common libraries.

This repo use Maven as build tool for monorepo, it is really not a monorepo-native build tool but can be made good use of with some tricks and usage of a couple of lesser known command line switches. We provide some commands to build applications and libs in README root.

We looked at this repo as example of java monorepo https://github.com/SpareBank1/monorepo-sample

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.