chore: all scalars support cast #6704

Job	Run time
Python (lint)	1m 59s
Rust build (all-features)	1m 58s
Rust build (default features)	1m 57s
Rust build (with tokio dispatcher)	1m 57s
Rust build (with compio dispatcher)	1m 57s
License Check and Audit Check	1m 59s
bench test	1m 59s
Check generated proto/fbs files are up to date	47s
Rust build (with tokio+compio dispatcher)	1m 57s
Rust build (wasm32 with default features)	1m 58s
miri	1m 58s
Python (test)	1m 58s
Rust (docs)	1m 48s
Rust (lint)	1m 57s
Rust (tests)	1m 46s
	27m 55s

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