feat: add Sys trait for swapping out system #186

Job	Run time
Rustfmt [Formatter]	6s
cargo-deny	18s
Compile (x86_64-unknown-linux-musl)	9s
Clippy [Linter] (ubuntu-latest)	11s
Compile (wasm32-wasi)	9s
Clippy [Linter] (windows-latest)	1m 18s
Compile (wasm32-unknown-unknown)	10s
Clippy [Linter] (macos-latest)	15s
Test Suite (ubuntu-latest, 1.70)	14s
Test Suite (ubuntu-latest, stable)	20s
Test Suite (ubuntu-latest, nightly)	13s
Test Suite (windows-latest, 1.70)	43s
Test Suite (windows-latest, stable)	1m 29s
Test Suite (windows-latest, nightly)	31s
Test Suite (macos-latest, 1.70)	26s
Test Suite (macos-latest, stable)	19s
Test Suite (macos-latest, nightly)	22s
	7m 13s

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