feat(host-rpc): add backpressure controls to notifier #626

Job	Run time
rust-library-base / Base Checks / Docs	5m 34s
rust-library-base / Base Checks / doctest	7m 53s
rust-library-base / Base Checks / Clippy	5m 22s
rust-library-base / Base Checks / Test Suite	12m 28s
rust-library-base / Base Checks / Rustfmt	52s
rust-library-base / Feature Checks	5m 29s
	37m 38s

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