Add Pie Chart trace #415

Job	Run time
Code Coverage	1m 49s
Clippy	3m 38s
Build Wasm Examples (wasm-yew-minimal)	47s
Build Examples (3d_charts)	32s
Build Examples (basic_charts)	24s
Rustfmt	12s
semver	1m 34s
Build Examples (custom_controls)	22s
Tests (ubuntu-latest)	1m 50s
Build Examples (financial_charts)	22s
Tests (windows-latest)	4m 17s
Build Examples (images)	37s
Tests (macos-latest)	1m 55s
Build Examples (kaleido)	1m 16s
Build Examples (maps)	22s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	23s
Build Examples (subplots)	21s
	21m 34s

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