2 Dock UI features: Expand panels horizontally + Increase grid size

[hungLink]

I created 2 improvement requests here:

#10005
#10006

Ultimately, I think that the dock in godot is great! I think it would be even better, and more customizable with these 2 features implemented.

What do you think?

[AThousandShips]

Since there's already proposals open, and people can discuss there, what's the purpose of this discussion?