Disable Checking Temporarily

[ZikangXiong]

Thank you very much for this awesome extension!

After bumping from version 14.1 to 18.1, it seems that we cannot disable the checking temporarily with a simple click. Usually, I only enable Grammarly after writing down a whole file to avoid distraction and reduce resource usage, so temporarily disabling the checking and enabling only when necessary will be very helpful. Could you bring this function back?

[znck]

Done #254