Added functionality for callbacks #473

Job	Run time
Clippy	2m 41s
Tests (ubuntu-latest)	2m 10s
Build Wasm Examples (wasm-yew-minimal)	58s
Tests (windows-latest)	4m 42s
Build Examples (3d_charts)	32s
Tests (macos-latest)	1m 48s
Code Coverage	13s
Build Examples (basic_charts)	49s
Rustfmt	11s
Build Examples (custom_controls)	21s
semver	49s
Build Examples (financial_charts)	34s
Build Examples (images)	36s
Build Examples (kaleido)	1m 17s
Build Examples (maps)	26s
Build Examples (ndarray)	36s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	23s
Build Examples (subplots)	22s
	19m 50s

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