[Proposal] Automatic release deployment to Extensions

[MrClock8163]

Motivation

Currently the release package has to be manually uploaded to the Extensions platform.

Description

The new web API theoretically allows the package to be uploaded in a CI/CD pipeline: https://developer.blender.org/docs/features/extensions/ci_cd/

This would simplify the release process.

Optionally, a unified version number management system could be setup in the action to further simplify the process.