Add Pie Chart trace #414

Job	Run time
semver	1m 22s
Build Wasm Examples (wasm-yew-minimal)	58s
Clippy	44s
Build Examples (3d_charts)	25s
Code Coverage	2m 13s
Build Examples (basic_charts)	25s
Rustfmt	11s
Tests (ubuntu-latest)	2m 14s
Build Examples (custom_controls)	22s
Tests (windows-latest)	4m 56s
Build Examples (financial_charts)	22s
Tests (macos-latest)	2m 34s
Build Examples (images)	37s
Build Examples (kaleido)	1m 28s
Build Examples (maps)	22s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	26s
Build Examples (subplots)	22s
	20m 46s

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