[WFCORE-6661] More accurate, resettable start time calculation

[bstansberry]

https://issues.redhat.com/browse/WFCORE-6661

This encapsulates the existing and possible future (WFCORE-6657) behavior around calculating and resetting 'start time' in a class, instead of passing around primitive 'startTime' longs and doing math. It uses RuntimeMXBean for the original 'start time' of a non-embedded process, instead of using Module.getStartTime(), which is a time when JBoss Modules started, not when the JVM did.

[yersan]

Hello @bstansberry are you interested in getting this for WF23?

[bstansberry]

@yersan Thanks for asking. No, this not urgent and shouldn't go in WF 31. It's a small foundation piece that's important for my prototyping at https://github.com/bstansberry/wildfly-core/commits/WildFly_CRaC, but that is just a research project. It's valid on it's own (it uses a more accurate JVM start time) so I went ahead and sent up the PR, but that benefit is quite minor and is not enough to justify doing it so late in the 31 work.

[wildfly-ci]

Core -> Full Integration Build 13423 outcome was UNKNOWN using a merge of 30d1528
Summary: Canceled (Tests passed: 7515, ignored: 101; exit code 143 (Step: Build & test full (Maven)) (new)) Build time: 03:36:38

[github-actions]

There has been no activity on this PR for 45 days. It will be auto-closed after 90 days.

[github-actions]

There has been no activity on this PR for 45 days. It will be auto-closed after 90 days.

[wildfly-ci]

Core -> Full Integration Build 13884 outcome was FAILURE using a merge of 1acec9d
Summary: Compilation error: Compiler (new) Build time: 00:01:03

[wildfly-ci]

Core -> WildFly Preview Integration Build 13680 outcome was FAILURE using a merge of 1acec9d
Summary: Compilation error: Compiler (new) Build time: 00:01:05

[wildfly-ci]

Core -> Full Integration Build 13609 outcome was FAILURE using a merge of 1acec9d
Summary: Compilation error: Compiler (new) Build time: 00:01:06

[yersan]

Upss, I made a mistake by resolving the conflicts directly.

[wildfly-ci]

Core -> Full Integration Build 13885 outcome was FAILURE using a merge of 6b05c02
Summary: Compilation error: Compiler (new) Build time: 00:00:43

[wildfly-ci]

Core -> WildFly Preview Integration Build 13681 outcome was FAILURE using a merge of 6b05c02
Summary: Compilation error: Compiler (new) Build time: 00:00:49

[wildfly-ci]

Core -> Full Integration Build 13610 outcome was FAILURE using a merge of 6b05c02
Summary: Compilation error: Compiler (new) Build time: 00:00:53

[bstansberry]

@yersan I rebased.

[yersan]

Thanks @bstansberry