chore: remove main fn #342

Job	Run time
feature checks	2m 3s
test stable (ubuntu-latest)	1m 16s
test stable --all-features (ubuntu-latest)	1m 52s
test 1.65 (ubuntu-latest)	56s
docs	1m 21s
clippy	1m 33s
test stable (macos-latest)	2m 26s
test stable --all-features (macos-latest)	3m 5s
fmt	10s
test 1.65 (macos-latest)	1m 38s
test stable (windows-latest)	4m 2s
test stable --all-features (windows-latest)	4m 6s
test 1.65 (windows-latest)	2m 14s
	26m 42s

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