feat: Add DHT and RequestResponse notifications #1260

Job	Run time
changes	6s
run-checks (ubuntu-latest, stable)	1m 33s
run-deny	1m 24s
run-checks (ubuntu-latest, nightly)	2m 32s
run-checks (macos-latest, stable)	2m 20s
run-docs	3m 1s
run-tests (ubuntu-latest, stable, all)	12m 42s
run-checks (macos-latest, nightly)	6m 51s
run-tests-windows (stable, all)	12m 27s
run-tests (ubuntu-latest, stable, none)	1m 21s
run-checks (windows-latest, stable)	7m 18s
run-checks (windows-latest, nightly)	4m 37s
run-tests-windows (stable, none)	7m 53s
run-tests (ubuntu-latest, nightly, all)	10m 59s
run-tests-windows (nightly, all)	12m 30s
run-tests (ubuntu-latest, nightly, none)	3m 38s
run-tests-windows (nightly, none)	7m 21s
run-tests (macos-latest, stable, all)	11m 30s
run-tests (macos-latest, stable, none)	6m 43s
run-tests (macos-latest, nightly, all)	12m 40s
run-tests (macos-latest, nightly, none)	6m 48s
	2h 16m 14s

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