ops(dspy): setting-up base actions and files for Semantic Release

[piotrlaczkowski]

• adding semantic release action
• adding semantic release configuration (to automatically bump up the version based on the commits in the repo and their label)
• adding python package release action template
• adding python unit-test template

(this PR won't have any functional impact as the final flow needs to be adjusted: adding docs build + versioning etc, and only brings base of the functionality)

Warning: this will require setting up some secrets (to be able to publish to pypi)