Add an ArrayBuffer that declares alignment #5883

Job	Run time
Python (test)	4m 30s
bench test	6m 27s
Rust build (all-features)	5m 9s
Check generated proto/fbs files are up to date	55s
Rust build (default features)	3m 16s
License Check and Audit Check	2m 14s
Rust build (with tokio dispatcher)	3m 15s
Rust build (with compio dispatcher)	3m 14s
miri	15m 5s
Python (lint)	3m 43s
Rust build (with tokio+compio dispatcher)	3m 16s
Rust build (wasm32 with default features)	2m 53s
Rust (docs)	1m 33s
Rust (tests)	8m 58s
	1h 4m 28s

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