Add Pie Chart trace #416

Job	Run time
Clippy	2m 54s
Tests (ubuntu-latest)	1m 46s
Build Wasm Examples (wasm-yew-minimal)	45s
Build Examples (3d_charts)	29s
Code Coverage	1m 48s
Build Examples (basic_charts)	26s
Tests (windows-latest)	4m 41s
Build Examples (custom_controls)	23s
Rustfmt	16s
semver	1m 27s
Build Examples (financial_charts)	23s
Build Examples (images)	38s
Tests (macos-latest)	1m 54s
Build Examples (kaleido)	1m 12s
Build Examples (maps)	24s
Build Examples (ndarray)	22s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	23s
Build Examples (subplots)	22s
	20m 54s

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