Split formatting checks to a seperate workflow #392

Job	Run time
Tests (stable, ubuntu-latest)	54s
Wasm Tests (stable)	52s
Tests (stable, windows-latest)	1m 38s
Wasm Tests (beta)	1m 0s
Tests (stable, macOS-latest)	2m 6s
Wasm Tests (nightly)	53s
Tests (beta, ubuntu-latest)	56s
Tests (beta, windows-latest)	2m 11s
Tests (beta, macOS-latest)	3m 11s
Tests (nightly, ubuntu-latest)	59s
Tests (nightly, windows-latest)	2m 35s
Tests (nightly, macOS-latest)	2m 27s
	19m 42s

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