chore: all scalars support cast #6706

Job	Run time
Python (test)	5m 22s
Rust build (all-features)	8m 46s
bench test	10m 6s
Rust build (default features)	6m 52s
Check generated proto/fbs files are up to date	51s
License Check and Audit Check	4m 48s
Rust build (with tokio dispatcher)	7m 14s
miri	8m 5s
Rust build (with compio dispatcher)	7m 6s
Python (lint)	3m 45s
Rust (docs)	1m 40s
Rust build (with tokio+compio dispatcher)	7m 0s
Rust (lint)	5m 56s
Rust build (wasm32 with default features)	3m 4s
Rust (tests)	11m 57s
	1h 32m 32s

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