RMET-3975 - Setup Actions to run unit tests and release the library

[alexgerardojacinto]

Description

• Adds the run-unit-tests.yml workflow to run the library's unit tests.
• Adds the publish-android.yml workflow to publish the library in a Maven public repository, so that it can be consumed by our Capacitor and Cordova plugins.
  • This includes adding the publish-android.sh script and the corresponding Gradle files.
• Updates README.md file with documentation for the library.

Context

References: https://outsystemsrd.atlassian.net/browse/RMET-3975

Type of changes

• Fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Refactor (cosmetic changes)
• Breaking change (change that would cause existing functionality to not work as expected)

Platforms affected

• Android
• iOS
• JavaScript

Tests

Successful runs of both actions: https://github.com/ionic-team/OSGeolocationLib-Android/actions

Screenshots (if appropriate)

Checklist

• Pull request title follows the format RNMT-XXXX <title>
• Code follows code style of this project
• CHANGELOG.md file is correctly updated
• Changes require an update to the documentation
  • Documentation has been updated accordingly

[OS-ricardomoreirasilva]

Maybe we should keep LICENSE, README and CHANGELOG in the root folder.