auto toggle toolbar when suggestions are available

[codokie]

I added a new setting that makes the suggestions appear automatically as they become available without having to touch the expand toolbar key. If there is no character before the cursor (when starting input or after a newline), the main toolbar will be shown. This functionality is present in many other mainstream keyboards. I believe this fixes #449 Here is a short demo

https://github.com/Helium314/HeliBoard/assets/151087174/fa02c16b-3d97-4c2a-a380-4afc7c969bf7