Split layout into multiple modules #512

Job	Run time
Rustfmt	14s
Clippy	2m 2s
semver	46s
Build Examples (3d_charts)	24s
Build Wasm Examples (wasm-yew-minimal)	58s
Build Examples (basic_charts)	26s
Build Wasm Examples (wasm-yew-callback-minimal)	49s
Build Examples (custom_controls)	33s
Build Examples (financial_charts)	33s
Code Coverage	9s
Tests (ubuntu-latest)	2m 28s
Build Examples (images)	37s
Tests (windows-latest)	3m 26s
Build Examples (kaleido)	1m 44s
Tests (macos-latest)	2m 46s
Build Examples (maps)	27s
Build Examples (ndarray)	55s
Build Examples (scientific_charts)	29s
Build Examples (shapes)	28s
Build Examples (subplots)	32s
	20m 46s

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