Serve subscriptions/listen with a pluggable event bus (SEP-2575) #3257

Job	Run time
checks / docs	41s
checks / readme-snippets	12s
checks / pre-commit	50s
checks / test (3.12, locked, ubuntu-latest)	1m 35s
checks / test (3.12, lowest-direct, windows-latest)	2m 0s
checks / test (3.11, lowest-direct, windows-latest)	2m 23s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.14, locked, windows-latest)	2m 41s
checks / test (3.11, locked, ubuntu-latest)	1m 17s
checks / test (3.14, lowest-direct, windows-latest)	1m 16s
checks / test (3.14, locked, ubuntu-latest)	2m 23s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.12, locked, windows-latest)	1m 56s
checks / test (3.11, locked, windows-latest)	1m 41s
checks / test (3.13, locked, windows-latest)	1m 47s
checks / test (3.13, locked, ubuntu-latest)	1m 13s
checks / test (3.10, locked, ubuntu-latest)	1m 19s
checks / test (3.10, lowest-direct, windows-latest)	1m 59s
checks / test (3.10, locked, windows-latest)	1m 47s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.13, lowest-direct, windows-latest)	2m 33s
all-green	2s
	36m 5s

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