Fix --version for new branch structure

[Baltoli]

To get the correct version tag from the release branch under the new structure, the following steps are followed:

1. Find the common ancestor of master and the current commit using git merge-base.
2. Identify the first tag that contains that common ancestor using git describe --contains.
3. Use various other git invocations to parse out the SHA, distance from merge base, and dirty status.

Fixes #2391.

[radumereuta]

I checked out your branch,

$ mvn clean
$ mvn package -DskipTests
$ kompile --version
K version:    v5.2.62
Build date:   Fri Jan 21 17:38:47 EET 2022

This branch is two commits ahead of master, but that's not reflected in the reported version.

[Baltoli]

Oh, good catch - --contains changes the behaviour of git describe, so I'll have to use another command to get the distance the current commit is ahead of the merge base.

[radumereuta]

tested, lgtm