Add an ArrayBuffer that declares alignment #5877

Job	Run time
Rust (docs)	1m 24s
Python (test)	1m 53s
bench test	2m 23s
Rust build (all-features)	1m 34s
Check generated proto/fbs files are up to date	59s
License Check and Audit Check	2m 15s
Rust build (default features)	1m 11s
miri	1m 46s
Rust build (with tokio dispatcher)	49s
Python (lint)	2m 21s
Rust build (with compio dispatcher)	1m 12s
Rust (tests)	1m 34s
Rust build (with tokio+compio dispatcher)	1m 19s
Rust build (wasm32 with default features)	1m 28s
	22m 8s

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