updated Searchbar class component to functional component

[ankit9928]

Fixes #2358

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• [ yes] is descriptively named and links to an issue number, i.e. Fixes #123

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• p5.js-web-editor
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[ankit9928]

Thanku

[lindapaiste]

I'm going to close this PR because we have a bunch for this component and the throttle is not handled properly here. The throttledSearchChange function will get re-created on each re-render so it won't be effective at throttling.