move: break out `disabled_string` module #685

Job	Run time
Check (ubuntu-latest, stable)	38s
Check (ubuntu-latest, beta)	37s
Check (macOS-latest, beta)	32s
Format TOML with Taplo	6s
Check (windows-latest, stable)	1m 38s
Format Rust with `cargo fmt` (stable)	13s
Check (windows-latest, beta)	2m 1s
cargo-deny	21s
Check (macOS-latest, stable)	35s
block-autosquash-commits	0s
Clippy (stable)	36s
Clippy (beta)	36s
Documentation (beta)	33s
Test Suite (windows-latest, beta)	1m 43s
Test Suite (ubuntu-latest, beta)	1m 0s
Test Suite (windows-latest, stable)	2m 1s
Test Suite (macOS-latest, stable)	53s
Documentation (stable)	31s
Test Suite (macOS-latest, beta)	54s
Test Suite (ubuntu-latest, stable)	59s
	16m 27s

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