Use setuptools_scm to map PyPI package version to branch

[pinkwah]

We can use setuptools_scm.version.Version to convert GitHub branch and tags to PyPI-compatible strings, and use this as a lookup table for komodo packages that use * as version.

mapping = {}
for bt in branch_and_tags:
    try:
        version = setuptools_scm.version.Version(bt)
        mapping[str(version)] = bt
    except:  # Could not parse version string, ignore
        pass

print("Your branch is:", mapping["1.2.3b4"])  # => 1.2.3-beta.4

Github has APIs for getting branches and tags:

• https://docs.github.com/en/rest/reference/repos#list-repository-tags
• https://docs.github.com/en/rest/reference/repos#list-branches
  These are potentially paginated, so we should use an external Python package to fetch.

[markusdregi]

Snippet for getting releases from GitHub using pygithub.

>>> import github
>>> g = github.Github() # <- Use token or you will quickly use too many requests...
>>> repo = g.get_repo("equinor/ert")                  
>>> releases = repo.get_releases()
>>> [r.tag_name for r in releases]
['2.25.0-rc1', '2.25.0-rc0', ..., '2017.07']