[MOB-1048] feat: automatically release to maven

[JinW-Airwallex]

This PR:

• Added support to automatically close and release staging repository on Sonatype. Now every uploads will be automatically released to Maven Central.
• Abstracted shared Gradle build logic as you can see from the number of deleted lines of the PR. This will make maintaining much easier.
• Restructured the project to allow publish TrustDefender modules via Gradle task. This used to be a manual process involving very complicated operations.
• Similar to the changes we did for the iOS SDK. This will remove develop branch and will use main as the default branch. Releases can be triggered by using GitHub Actions.

Corresponding Confluence doc: https://airwallex.atlassian.net/wiki/spaces/SMEBANKING/pages/2745271260/Android+-+Maven

[github-actions[bot]]

Unit Test Results

234 tests  ±0   234 :heavy_check_mark: ±0   1m 24s :stopwatch: +4s   97 suites ±0       0 :zzz: ±0    97 files   ±0       0 :x: ±0 

Results for commit 36d92f45. ± Comparison against base commit afcb434e.

:recycle: This comment has been updated with latest results.