chore(guard): Refactor functions into enum / handle no args #809

Job	Run time
Testing Install Script (install-guard.sh) (ubuntu-latest)	4s
Testing Install Script (install-guard.sh) (macos-latest)	6s
Formatting check (cargo fmt)	17s
Testing Install Script (install-guard.sh) (macos-13-xlarge)	6s
Build all crates & run unit tests (ubuntu-latest)	1m 58s
Integration tests against aws-guard-rules-registry (ubuntu-latest)	1m 34s
Run Fuzz Checks (guard_dsl)	12m 36s
Build all crates & run unit tests (macos-latest)	1m 54s
Integration tests against aws-guard-rules-registry (macos-latest)	1m 33s
Testing Windows Install Script (install-guard.ps1)	17s
Run Fuzz Checks (yaml)	12m 35s
Integration tests against aws-guard-rules-registry (macos-13-xlarge)	1m 10s
Build all crates & run unit tests (macos-13-xlarge)	1m 42s
Build all crates & run unit tests (windows-latest)	1m 47s
Linting check (clippy)	28s
Shellcheck	3s
Spell Check with Typos	5s
Integration tests against aws-guard-rules-registry for Windows	3m 47s
	42m 2s

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