libflux: convert reactor to libuv #2462

Job	Run time
validate commits	0s
spelling	5s
Generate build matrix	10s
python linting	26s
bookworm - test-install	1m 5s
bookworm - 32 bit	1m 11s
noble - test-install	1m 17s
el9 - test-install	1m 15s
alpine - test-install	1m 4s
fedora40 - test-install	1m 11s
jammy - test-install	1m 4s
focal - py3.8	59s
bookworm - gcc-12,content-s3,distcheck	1m 5s
fedora40 - clang-18	1m 5s
coverage	1m 25s
el8 - ascii	1m 15s
el8 - test-install	1m 7s
el8 - system,coverage	1m 17s
inception	1m 3s
flux-sched check	56s
flux-accounting check	1m 2s
flux-pam check	1m 1s
flux-pmix check	1m 4s
Generate docker manifest	0s
	22m 7s

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