make scatter trace specific types public #439

Job	Run time
Code Coverage	1m 59s
Clippy	41s
Build Wasm Examples (wasm-yew-minimal)	56s
Build Examples (3d_charts)	32s
Build Examples (basic_charts)	35s
Build Examples (custom_controls)	33s
Rustfmt	16s
semver	2m 51s
Build Examples (financial_charts)	31s
Tests (ubuntu-latest)	1m 56s
Build Examples (images)	48s
Tests (windows-latest)	3m 32s
Build Examples (kaleido)	1m 42s
Tests (macos-latest)	2m 15s
Build Examples (maps)	30s
Build Examples (ndarray)	33s
Build Examples (scientific_charts)	32s
Build Examples (shapes)	36s
Build Examples (subplots)	30s
	21m 48s

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