CI: Release workflow

[ljubon]

What type of PR is this?

This is an improvement PR with the goal of enabling spark-dgraph-extension release using GitHub workflows

What this PR does / why we need it:

The goal of this task is to move the release process to GitHub workflow from current scripts that are run manually.
The current release process is documented in [RELEASE.md](https://github.com/G-Research/spark-extension/blob/master/RELEASE.md/.
Due to its complexity, we reached out to one of the maintainers Enrico who approved this idea of moving release.sh to a github workflow for it's transparent and better usage.

Resolves: https://github.com/G-Research/oss-portfolio-maturity/issues/368

Acceptance criteria / Notes for the reviewer:

• Keep the current process as is (not introducing breaking changes), so the maintainers should always be able to do it the old way - but this PR should introduce a workflow that will copy that behavior

Part of maturity matrix: https://github.com/G-Research/oss-portfolio-maturity/issues/368

[github-actions]

Test Results

 2 753 files  ±0   2 753 suites  ±0   50m 51s ⏱️ +43s
   486 tests ±0     485 ✅ ±0   1 💤 ±0  0 ❌ ±0 
39 807 runs  ±0  39 719 ✅ ±0  88 💤 ±0  0 ❌ ±0 

Results for commit d446f5d. ± Comparison against base commit d4ca49c.