Serve subscriptions/listen with a pluggable event bus (SEP-2575) #3262

Job	Run time
checks / readme-snippets	15s
checks / docs	42s
checks / pre-commit	47s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.13, locked, windows-latest)	2m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.11, lowest-direct, windows-latest)	1m 48s
checks / test (3.13, lowest-direct, windows-latest)	1m 48s
checks / test (3.12, locked, windows-latest)	2m 5s
checks / test (3.12, locked, ubuntu-latest)	1m 27s
checks / test (3.13, locked, ubuntu-latest)	1m 14s
checks / test (3.14, lowest-direct, windows-latest)	1m 44s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.11, locked, ubuntu-latest)	1m 16s
checks / test (3.14, locked, windows-latest)	2m 49s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.11, locked, windows-latest)	1m 50s
checks / test (3.10, locked, ubuntu-latest)	1m 21s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.10, locked, windows-latest)	1m 41s
checks / test (3.12, lowest-direct, windows-latest)	1m 52s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.10, lowest-direct, windows-latest)	1m 59s
all-green	2s
	35m 37s

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