add `ResourceJournalConsumer` and `EventLogFormatter` classes and use them to standardize `flux resource eventlog` #10255

Job	Run time
validate commits	9s
python linting	35s
Generate build matrix	10s
spelling	8s
bookworm - test-install	12m 11s
bookworm - 32 bit	13m 33s
noble - test-install	12m 52s
el9 - test-install	13m 6s
alpine - test-install	12m 49s
fedora40 - test-install	30m 31s
jammy - test-install	11m 55s
focal - py3.8	16m 54s
bookworm - gcc-12,content-s3,distcheck	20m 0s
fedora40 - clang-18	16m 51s
coverage	24m 54s
el8 - ascii	20m 22s
el8 - test-install	13m 28s
el8 - system,coverage	7m 29s
inception	21m 59s
flux-pam check	4m 19s
flux-pmix check	12m 48s
flux-accounting check	4m 41s
macos build only	3m 23s
flux-sched check	7m 14s
Generate docker manifest	0s
	4h 42m 21s

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