kvs: add transaction stats #10126

Job	Run time
python linting	30s
python linting	30s
spelling	5s
spelling	5s
Generate build matrix	6s
Generate build matrix	6s
validate commits	10s
validate commits	10s
bookworm - test-install	12m 25s
bookworm - test-install	12m 25s
bookworm - 32 bit	13m 0s
bookworm - 32 bit	13m 0s
noble - test-install	12m 41s
noble - test-install	12m 41s
el9 - test-install	12m 37s
el9 - test-install	12m 37s
alpine - test-install	12m 58s
alpine - test-install	12m 58s
fedora40 - test-install	1h 0m 25s
fedora40 - test-install	12m 20s
jammy - test-install	11m 54s
jammy - test-install	11m 54s
focal - py3.8	16m 56s
focal - py3.8	16m 56s
bookworm - gcc-12,content-s3,distcheck	20m 13s
bookworm - gcc-12,content-s3,distcheck	20m 13s
fedora40 - clang-18	1h 0m 26s
fedora40 - clang-18	17m 15s
coverage	24m 30s
coverage	24m 30s
el8 - ascii	19m 16s
el8 - ascii	19m 16s
el8 - test-install	14m 13s
el8 - test-install	14m 13s
el8 - system,coverage	7m 3s
el8 - system,coverage	7m 3s
inception	21m 11s
inception	21m 11s
flux-accounting check	4m 30s
flux-accounting check	4m 30s
flux-pam check	4m 10s
flux-pam check	4m 10s
flux-pmix check	13m 1s
flux-pmix check	13m 1s
macos build only	3m 14s
macos build only	3m 14s
flux-sched check	6m 44s
flux-sched check	6m 44s
Generate docker manifest	0s
Generate docker manifest	1s
	10h 13m 21s

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