Toggle for new "Clear Selection" button

[loughlinclaus3]

Hi, can you add a toggle hidden to the table options for the new "Clear Selection" button in the MRT_ToolbarAlertBanner? Or alternatively, allow users to pass in props that can hide the button (without hiding the selectedCountOfRowCountRowsSelected localization text?

It'd be nice to be able to hide the button if I don't want users to see it, and the "select/deselect all" checkbox already performs an equivalent function when selectAllMode is set to "all". I've got a custom theme for the header, and it kinda clashes.

If not, I could try giving it a go, and make a PR with the option. I've only been using the package for a few weeks, but I'm really liking it so far!

[KevinVandy]

That's what the renderToolbarAlertBannerContent is for. If you don't like the default implementation, just render your own message using the table instance apis