IPC Message clean up #5724

Job	Run time
bench test	7m 4s
Check generated proto/fbs files are up to date	47s
Rust build (all-features)	8m 41s
License Check and Audit Check	2m 40s
Rust build (default features)	6m 23s
miri	14m 44s
Rust build (with tokio dispatcher)	6m 9s
Python (lint)	3m 33s
Rust build (with compio dispatcher)	6m 27s
Python (test)	6m 0s
Rust build (with tokio+compio dispatcher)	6m 27s
Rust (docs)	1m 51s
Rust (tests)	10m 6s
Rust build (wasm32 with default features)	3m 1s
	1h 23m 53s

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