Update how we do versions

[jwrober]

Is your feature request related to a problem? Please describe. Right now we have a somewhat complex version string. I think we can do better to make it easier to read.

Describe the solution you'd like Change the version to go like this:

[major version].[minor version].[gh hex hash]-[string].[level]

e.g. 3.0.729e3fb-rc.2 or 3.0-729e3fb.stable.0

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Came up as part of review of #1726

[lmoureaux]

Do we need to keep the git hash in the version string? It makes the versions not monotonous.

[jwrober]

I'd be fine with that too.