Rework wasm feature and make it work with getrandom 0.3 #454

Job	Run time
semver	42s
Clippy	3m 0s
Code Coverage	14s
Rustfmt	11s
Tests (ubuntu-latest)	2m 7s
Build Wasm Examples (wasm-yew-minimal)	54s
Tests (windows-latest)	3m 55s
Build Examples (3d_charts)	33s
Tests (macos-latest)	1m 56s
Build Examples (basic_charts)	34s
Build Examples (custom_controls)	31s
Build Examples (financial_charts)	31s
Build Examples (images)	44s
Build Examples (kaleido)	1m 20s
Build Examples (maps)	29s
Build Examples (ndarray)	32s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	33s
Build Examples (subplots)	31s
	19m 47s

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