Split layout into multiple modules #527

Job	Run time
Clippy	3m 1s
Rustfmt	14s
Tests (windows-latest)	5m 9s
Tests (macos-latest)	3m 0s
Tests (ubuntu-latest)	2m 3s
semver	49s
Build Wasm Examples (callback-example)	1m 0s
Code Coverage	9s
Build Wasm Examples (basic)	53s
Build Examples (custom_controls)	22s
Build Examples (basic_charts)	24s
Build Examples (maps)	20s
Build Examples (financial_charts)	24s
Build Examples (subplots)	26s
Build Examples (kaleido)	1m 10s
Build Examples (scientific_charts)	24s
Build Examples (3d_charts)	24s
Build Examples (images)	38s
Build Examples (ndarray)	24s
Build Examples (shapes)	23s
	21m 37s

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