Serve subscriptions/listen with a pluggable event bus (SEP-2575) #3273

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	56s
checks / docs	42s
checks / test (3.11, lowest-direct, windows-latest)	1m 57s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.10, lowest-direct, windows-latest)	1m 45s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.10, locked, ubuntu-latest)	1m 22s
checks / test (3.11, locked, ubuntu-latest)	1m 18s
checks / test (3.10, locked, windows-latest)	1m 54s
checks / test (3.11, locked, windows-latest)	1m 42s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.12, locked, windows-latest)	1m 54s
checks / test (3.13, locked, windows-latest)	2m 1s
checks / test (3.12, lowest-direct, windows-latest)	1m 42s
checks / test (3.14, lowest-direct, windows-latest)	1m 41s
checks / test (3.12, locked, ubuntu-latest)	1m 35s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.13, lowest-direct, windows-latest)	1m 59s
checks / test (3.13, locked, ubuntu-latest)	1m 10s
all-green	2s
	35m 56s

Provide feedback