fix(types): fix cssClasses of voiceSearch

[eunjae-lee]

Summary

This allows the widget can accept an array of string as css classes.
This was missing in the first place, allowing only strings.

[eunjae-lee]

fixing the lint errors now..

[Haroenv]

linting is failing though 🤔

[algobot]

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Built with commit c8fb656

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[eunjae-lee]

Here's a headache. The reason why the lint failed is because the type of cssClasses changes.

At the widget, cssClasses should be

export type VoiceSearchCSSClasses = {
  root: string | string[];
  button: string | string[];
  status: string | string[];
};

At the component, cssClasses should be

export type VoiceSearchComponentCSSClasses = {
  root: string;
  button: string;
  status: string;
};

Here, cssClasses are being modified from VoiceSearchCSSClasses to VoiceSearchComponentCSSClasses, but at the renderer it's still inferred as VoiceSearchCSSClasses because of the type of the widget params.

So as a workaround, I casted cssClasses to VoiceSearchComponentCSSClasses at rendering the component.

Do you have any better idea?