Added functionality for callbacks #494

Job	Run time
Rustfmt	13s
Rustfmt	13s
Clippy	3m 6s
Clippy	3m 6s
Build Wasm Examples (wasm-yew-minimal)	50s
Build Wasm Examples (wasm-yew-minimal)	50s
semver	39s
semver	39s
Build Examples (3d_charts)	24s
Build Examples (3d_charts)	24s
Build Wasm Examples (wasm-yew-callback-minimal)	49s
Build Wasm Examples (wasm-yew-callback-minimal)	49s
Build Examples (basic_charts)	26s
Build Examples (basic_charts)	26s
Tests (ubuntu-latest)	2m 3s
Tests (ubuntu-latest)	2m 3s
Build Examples (custom_controls)	41s
Build Examples (custom_controls)	41s
Tests (windows-latest)	4m 31s
Tests (windows-latest)	4m 31s
Code Coverage	8s
Code Coverage	8s
Build Examples (financial_charts)	22s
Build Examples (financial_charts)	22s
Tests (macos-latest)	2m 17s
Tests (macos-latest)	2m 17s
Build Examples (images)	36s
Build Examples (images)	36s
Build Examples (kaleido)	1m 11s
Build Examples (kaleido)	1m 10s
Build Examples (maps)	20s
Build Examples (maps)	20s
Build Examples (ndarray)	24s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	23s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	24s
Build Examples (shapes)	24s
Build Examples (subplots)	22s
Build Examples (subplots)	22s
	40m 17s

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