Add Pie Chart trace #417

Job	Run time
Clippy	2m 42s
Code Coverage	2m 11s
Build Examples (3d_charts)	23s
Build Wasm Examples (wasm-yew-minimal)	47s
Build Examples (basic_charts)	23s
Rustfmt	12s
semver	1m 42s
Build Examples (custom_controls)	23s
Tests (ubuntu-latest)	1m 50s
Build Examples (financial_charts)	23s
Tests (windows-latest)	3m 56s
Build Examples (images)	37s
Tests (macos-latest)	1m 50s
Build Examples (kaleido)	1m 32s
Build Examples (maps)	23s
Build Examples (ndarray)	28s
Build Examples (scientific_charts)	24s
Build Examples (shapes)	25s
Build Examples (subplots)	22s
	20m 53s

Provide feedback