chore: Rearrange project as a workspace #604

Job	Run time
Test performance on benchmarks	53s
Enforce Rust code format	13s
License / vulnerability audit (advisories)	20s
License / vulnerability audit (bans licenses sources)	16s
Clippy	23s
Preflight docs.rs build	14s
Preflight crate publish (ubuntu-latest, stable)	19s
Unit tests with minimum versions of direct dependencies (windows-latest)	49s
Unit tests (windows-latest, stable)	2m 17s
Unit tests with minimum versions of direct dependencies (macos-latest)	30s
Check for unused dependencies	24s
Unit tests (windows-latest, 1.74.0)	1m 32s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	20s
Unit tests (macos-latest, stable)	45s
Unit tests (macos-latest, 1.74.0)	41s
Unit tests (ubuntu-latest, stable)	43s
Unit tests (ubuntu-latest, 1.74.0)	38s
	11m 17s

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