RFR: 5641: Rule that looks at G1 MMU Information [v3]

[Alex Macdonald]

> This PR addresses JMC-5641 [[0]](https://bugs.openjdk.org/browse/JMC-5641), in which it would be nice to have a rule that looks at g1mmu information. Specifically, the issue makes note that this rule should compare gcTime of pauses and check if the pause time is over the target.
> 
> Example result when okay:
> ![g1mmu_okay](https://github.com/openjdk/jmc/assets/10425301/7b371027-d992-4d70-84fe-f8ad9ffb4088)
> 
> Example result when warning:
> ![g1mmu_warning](https://github.com/openjdk/jmc/assets/10425301/15803bc4-2d4f-4e53-9944-c97347564e39)
> 
> [0] https://bugs.openjdk.org/browse/JMC-5641

Alex Macdonald has updated the pull request incrementally with one additional commit since the last revision:

  run spotless:apply

-------------

Changes:
  - all: https://git.openjdk.org/jmc/pull/488/files
  - new: https://git.openjdk.org/jmc/pull/488/files/9bccee97..b82853cf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=488&range=02
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=488&range=01-02

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmc/pull/488.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/488/head:pull/488

PR: https://git.openjdk.org/jmc/pull/488