Publish to MavenCentral

[steelahhh]

Since bintray/jcenter are shutting down soon let's publish to MavenCentral instead

Resources:

• https://blog.autsoft.hu/publishing-an-android-library-to-mavencentral-in-2019/
• https://medium.com/@daptronic/publishing-android-or-java-binaries-to-maven-central-d334a4f89b81
• https://proandroiddev.com/publishing-your-first-android-library-to-mavencentral-be2c51330b88