feat: add wait and wait_timeout to mq_broker; closes #1879 #644

Job	Run time
changelog-and-linters / linters / Run Tox based code tests	46s
changelog-and-linters / changelog / Require a changelog	10s
sanity / sanity / py3.8 / ubuntu-latest / stable-2.13	3m 14s
sanity / sanity / py3.9 / ubuntu-latest / stable-2.13	3m 41s
sanity / sanity / py3.10 / ubuntu-latest / stable-2.13	4m 12s
units / unit-source / py3.9 / stable-2.13	1m 26s
sanity / sanity / py3.9 / ubuntu-latest / stable-2.14	3m 54s
units / unit-source / py3.10 / stable-2.13	1m 54s
sanity / sanity / py3.10 / ubuntu-latest / stable-2.14	3m 12s
units / unit-source / py3.9 / stable-2.14	1m 36s
sanity / sanity / py3.11 / ubuntu-latest / stable-2.14	3m 50s
units / unit-source / py3.10 / stable-2.14	1m 34s
sanity / sanity / py3.9 / ubuntu-latest / stable-2.15	4m 4s
units / unit-source / py3.9 / stable-2.15	1m 44s
sanity / sanity / py3.10 / ubuntu-latest / stable-2.15	3m 57s
units / unit-source / py3.10 / stable-2.15	1m 13s
sanity / sanity / py3.11 / ubuntu-latest / stable-2.15	2m 55s
units / unit-source / py3.10 / milestone	1m 15s
sanity / sanity / py3.10 / ubuntu-latest / milestone	3m 24s
units / unit-source / py3.10 / devel	1m 18s
sanity / sanity / py3.11 / ubuntu-latest / milestone	2m 58s
sanity / sanity / py3.10 / ubuntu-latest / devel	2m 56s
sanity / sanity / py3.11 / ubuntu-latest / devel	2m 52s
all_green	2s
	58m 7s

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