RFR: 5641: Rule that looks at G1 MMU Information [v2]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' of https://git.openjdk.org/jmc into 5641
 - use a comparison filter for determining number of exceeded events
 - 5641: Rule that looks at G1 MMU Information

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

Changes:
  - all: https://git.openjdk.org/jmc/pull/488/files
  - new: https://git.openjdk.org/jmc/pull/488/files/7a882610..9bccee97

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=488&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=488&range=00-01

  Stats: 513 lines in 110 files changed: 281 ins; 184 del; 48 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