feat: Move `signing_alg_from_sign1` into `c2pa-crypto` #3917

Job	Run time
Enforce Rust code format	12s
Default features build	20s
License / vulnerability audit (advisories)	24s
License / vulnerability audit (bans licenses sources)	23s
Clippy	36s
Preflight docs.rs build	2m 9s
Doc tests (requires nightly Rust) (windows-latest)	6m 15s
Unit tests with minimum versions of direct dependencies (windows-latest)	3m 20s
Doc tests (requires nightly Rust) (macos-latest)	1m 59s
Unit tests with minimum versions of direct dependencies (macos-latest)	1m 31s
Doc tests (requires nightly Rust) (ubuntu-latest)	2m 1s
Unit tests (windows-latest, stable)	4m 16s
Unit tests (c2patool) (windows-latest, stable)	2m 13s
Unit tests (windows-latest, 1.81.0)	3m 35s
Unit tests (c2patool) (macos-latest, stable)	1m 2s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	1m 5s
Unit tests (macos-latest, stable)	1m 13s
Unit tests (c2patool) (ubuntu-latest, stable)	1m 1s
Unit tests (aarch64-unknown-linux-gnu, stable)	4m 14s
Unit tests (macos-latest, 1.81.0)	1m 29s
Unit tests (aarch64-unknown-linux-gnu, 1.81.0)	4m 36s
Unit tests (ubuntu-latest, stable)	1m 19s
Unit tests (WASM)	2m 31s
Check for unused dependencies	2m 22s
Unit tests (ubuntu-latest, 1.81.0)	1m 28s
	51m 34s

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