make scatter trace specific types public #440

Job	Run time
Clippy	3m 2s
Rustfmt	14s
Build Wasm Examples (wasm-yew-minimal)	59s
Build Examples (3d_charts)	34s
Code Coverage	2m 5s
semver	36s
Build Examples (basic_charts)	35s
Tests (ubuntu-latest)	2m 17s
Build Examples (custom_controls)	30s
Build Examples (financial_charts)	32s
Build Examples (images)	45s
Tests (windows-latest)	4m 2s
Build Examples (kaleido)	1m 18s
Tests (macos-latest)	2m 9s
Build Examples (maps)	30s
Build Examples (ndarray)	31s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	33s
Build Examples (subplots)	31s
	22m 13s

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