Function useCache

Think of this as useMemo but across component instances

Example

 export const FormattedRelativeTime = ({ value, unit, ...options }: FormattedRelativeTimeProps) => {
     const { i18n } = useLingui();

     const formatter = useCache(
         () => new Intl.RelativeTimeFormat(i18n.locale, options),
         ["FormattedRelativeTime", i18n.locale, JSON.stringify(options)]
     );

     return formatter.format(value, unit) as unknown as JSX.Element;
 };
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