Include Build Number in Start logs and /geyser version

[Chew]

What feature do you want?
It would be nice to see the Build number in the startup logs to see what build you're on in case something goes sour and you can't make a dump.

Additionally, seeing it in /geyser version is a clear indication of how many builds you are, and it would be nice if it could mimic the behavior of /icanhasbukkit and show how many builds behind you are.

Alternatives?
Crying myself to sleep never knowing what build I'm on

[jkcoxson]

This is a great idea, although may not work in practice. CI handles the build numbering. What we could do instead is what Dolphin does; include the git hash in Geyser versioning to compare what version you are on.

[Camotoy]

We include a git.properties file that holds the build number.

[jkcoxson]

The jar or plugin, which people are downloading and using, does not create git.properties. I think that is the feature request here. From what I know about the code, it creates it on build.

Geyser/connector/pom.xml

Line 219 in d1c571d

<generateGitPropertiesFilename>${project.build.outputDirectory}/git.properties</generateGitPropertiesFilename>