add customdata to HeatMap #505

Job	Run time
semver	44s
Rustfmt	13s
Build Wasm Examples (wasm-yew-minimal)	48s
Build Examples (3d_charts)	24s
Clippy	2m 59s
Build Wasm Examples (wasm-yew-callback-minimal)	56s
Build Examples (basic_charts)	24s
Tests (ubuntu-latest)	2m 20s
Build Examples (custom_controls)	22s
Tests (windows-latest)	4m 51s
Build Examples (financial_charts)	25s
Tests (macos-latest)	2m 14s
Code Coverage	8s
Build Examples (images)	35s
Build Examples (kaleido)	1m 15s
Build Examples (maps)	23s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	45s
Build Examples (shapes)	30s
Build Examples (subplots)	21s
	21m 1s

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