Support for `onClick` for the `Link` component

[TimurKr]

Hi! From what I understand, the <Link /> component simply ads an onClick property to the default Link. But this gets overwritten if we manually set onClick on it, essentially making it useless. I will make a PR to fix this.

/**
 * A custom Link component that wraps Next.js's next/link component.
 */
export function Link({
    href,
    children,
    replace,
    scroll,
    ...rest
}: Parameters<typeof NextLink>[0]) {
    const router = useRouter();
    const startProgress = useProgress()

    return (
        <NextLink
            href={href}
            onClick={(e) => {
                if (isModifiedEvent(e)) return;
                e.preventDefault();
                startTransition(() => {
                    startProgress()
                    const url = typeof href === 'string' ? href : formatUrl(href)
                    if (replace) {
                        router.replace(url, { scroll })
                    } else {
                        router.push(url, { scroll })
                    }
                })
            }}
            {...rest} // Here if rest includes `onClick`, it overwrites the functionality
        >
            {children}
        </NextLink>
    );
}