add prometheus metrics for Genie

[sbock-slack]

• Add dependencies to Genie that are needed to support the /admin/prometheus endpoint.

• We've built our own JARs and are already using Prometheus to power our metrics around Genie's health. Hoping to remove the need for us to locally fork Genie by getting this into open source 👍

[babourine-slack]

👋 Hi @bhou2 ! Thank you for hard work on maintaining Genie! Was wondering if we could get some traction on this PR? Will be happy to adjust it if needed and will appreciate an approx ETA so we could adjust accordingly.

[bhou2]

Thanks @babourine-slack I did not get the notification about this PR in the past several weeks. Checking.

[bhou2]

Could you clarify the tests you have done?

[babourine-slack]

Could you clarify the tests you have done?

We built it locally with all tests as well as running it in prod for weeks now w/o any issues. If there is any specific process that we should follow to contribute we'll be happy to do. There are two areas we would like to contribute in:

• Modernize docker container that goes to the dockerhub (primarily because of the number of critical security issues baked into it)
• Bump versions of some dependencies up as unfortunately the current jars carry many critical CVEs due to those dependencies. :(