Add an ArrayBuffer that declares alignment #5878

Job	Run time
Python (test)	4m 27s
Rust build (all-features)	9m 46s
Python (lint)	3m 37s
Rust (docs)	2m 22s
Rust build (default features)	7m 26s
Rust build (with tokio dispatcher)	7m 7s
bench test	13m 58s
Rust build (with compio dispatcher)	7m 3s
Check generated proto/fbs files are up to date	1m 8s
Rust build (with tokio+compio dispatcher)	7m 19s
License Check and Audit Check	3m 38s
Rust build (wasm32 with default features)	3m 38s
miri	11m 4s
Rust (tests)	13m 17s
	1h 35m 50s

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