feat: add Sys trait for swapping out system #184

Job	Run time
cargo-deny	16s
Clippy [Linter] (ubuntu-latest)	15s
Compile (x86_64-unknown-linux-musl)	19s
Clippy [Linter] (windows-latest)	1m 21s
Rustfmt [Formatter]	9s
Compile (wasm32-wasi)	36s
Clippy [Linter] (macos-latest)	27s
Compile (wasm32-unknown-unknown)	33s
Test Suite (ubuntu-latest, 1.70)	22s
Test Suite (ubuntu-latest, stable)	15s
Test Suite (ubuntu-latest, nightly)	20s
Test Suite (windows-latest, 1.70)	51s
Test Suite (windows-latest, stable)	1m 20s
Test Suite (windows-latest, nightly)	47s
Test Suite (macos-latest, 1.70)	34s
Test Suite (macos-latest, stable)	32s
Test Suite (macos-latest, nightly)	35s
	9m 32s

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