add script to manage version

[jburel]

Looking at the release process to add to ome-contributing, I think this script could be useful to bump various version
Similar to what we do with bump2version in the Python repos

[sbesson]

I can certainly give this script a try for the next Bio-Formats release. Note given the simplicity of the commands described in https://ome-contributing.readthedocs.io/en/latest/bioformats-release-process.html#fiji-update-site, I am not convinced by the benefit of wrapping them in a shell script rather than executing them individually.

In practice, I think the sequence of actions I followed during the 8.0.1 release was the following:
1- edit version and bioformats.version by hand in pom.xml
2- run the mvn clean package command to update my local distribution
3- test Fiji and upload the JARs to the update site
4- commit, tag and push to origin