Added functionality for callbacks #487

Job	Run time
Tests (ubuntu-latest)	1m 56s
Tests (windows-latest)	2m 49s
Rustfmt	13s
Clippy	2m 19s
Code Coverage	8s
Tests (macos-latest)	3m 7s
semver	38s
Build Examples (3d_charts)	27s
Build Wasm Examples (wasm-yew-minimal)	49s
Build Examples (basic_charts)	26s
Build Examples (custom_controls)	22s
Build Examples (financial_charts)	26s
Build Examples (images)	37s
Build Examples (kaleido)	1m 15s
Build Examples (maps)	50s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	34s
Build Examples (shapes)	23s
Build Examples (subplots)	22s
	18m 5s

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