Added functionality for callbacks #488

Job	Run time
Tests (ubuntu-latest)	1m 52s
Tests (windows-latest)	5m 4s
Build Wasm Examples (wasm-yew-minimal)	58s
Clippy	4m 4s
Build Examples (3d_charts)	22s
Tests (macos-latest)	2m 20s
Build Examples (basic_charts)	28s
Code Coverage	11s
Build Examples (custom_controls)	28s
Rustfmt	15s
Build Examples (financial_charts)	22s
semver	38s
Build Examples (images)	36s
Build Examples (kaleido)	1m 17s
Build Examples (maps)	22s
Build Examples (ndarray)	28s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	28s
Build Examples (subplots)	21s
	20m 55s

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