Split layout into multiple modules #526

Job	Run time
semver	49s
Tests (macos-latest)	3m 21s
Rustfmt	14s
Code Coverage	9s
Clippy	3m 2s
Tests (ubuntu-latest)	2m 21s
Tests (windows-latest)	3m 40s
Build Wasm Examples (basic)	51s
Build Wasm Examples (callback-example)	59s
Build Examples (basic_charts)	29s
Build Examples (subplots)	34s
Build Examples (maps)	25s
Build Examples (3d_charts)	26s
Build Examples (custom_controls)	24s
Build Examples (scientific_charts)	24s
Build Examples (financial_charts)	26s
Build Examples (ndarray)	28s
Build Examples (kaleido)	1m 34s
Build Examples (shapes)	25s
Build Examples (images)	37s
	21m 38s

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