Added functionality for callbacks #493

Job	Run time
semver	46s
Rustfmt	13s
Code Coverage	9s
Clippy	2m 59s
Build Wasm Examples (wasm-yew-minimal)	52s
Build Examples (3d_charts)	22s
Build Wasm Examples (wasm-yew-callback-minimal)	50s
Tests (ubuntu-latest)	2m 21s
Build Examples (basic_charts)	25s
Tests (windows-latest)	5m 4s
Build Examples (custom_controls)	26s
Tests (macos-latest)	2m 20s
Build Examples (financial_charts)	24s
Build Examples (images)	38s
Build Examples (kaleido)	1m 31s
Build Examples (maps)	29s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	29s
Build Examples (subplots)	30s
	21m 33s

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