Add support for SpecialComponents to be any ComponentType

[Methuselah96]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

Changes the SpecialComponents to allow them to be any ComponentType (not just a function component).

My use case is adding styles to the components with Material-UI. Here's an example of what I'm trying to do:

export default function Markdown(props: ReactMarkdownOptions) {
  return (
    <ReactMarkdown
      components={{
        li: withStyles(styles)(
          ({
            classes,
            color,
            node,
            ref,
            ...props
          }: JSX.IntrinsicElements['li'] &
            ReactMarkdownProps & {
              checked: boolean | null;
              index: number;
              ordered: boolean;
            } & WithStyles<typeof styles>) => (
            <li className={classes.listItem}>
              <Typography paragraph component="span" {...props} />
            </li>
          ),
        ),
      }}
      {...props}
    />
  );
}

[ChristianMurphy]

Thanks @Methuselah96!

[wooorm]

Sorry, forgot about this PR. Released!