Client notification support #3548

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	10s
checks / test (3.10, lowest-direct, windows-latest)	1m 51s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, highest, ubuntu-latest)	42s
checks / test (3.10, highest, windows-latest)	1m 55s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 11s
checks / test (3.11, highest, ubuntu-latest)	42s
checks / test (3.12, highest, windows-latest)	3m 10s
checks / test (3.11, highest, windows-latest)	2m 33s
checks / test (3.13, highest, windows-latest)	2m 10s
checks / test (3.12, highest, ubuntu-latest)	45s
checks / test (3.12, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.13, highest, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, windows-latest)	2m 4s
checks / test (3.12, lowest-direct, windows-latest)	2m 49s
	25m 23s

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