ci: Refactor workflows layout #1

Job	Run time
build_default_features (ubuntu-latest)	1m 1s
build_default_features (macos-latest)	2m 1s
check_clippy	2m 8s
build_default_features (windows-latest)	1m 55s
check_docs	2m 10s
check_msrv	2m 7s
build_all_features	2m 9s
build_all_platforms (ubuntu-latest)	2m 8s
build_under_wasm	45s
build_all_platforms (macos-latest)	2m 4s
unit	2m 12s
build_all_platforms (windows-latest)	2m 5s
	22m 45s

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