[DOCS] Write member, signals and constants in the Control class

I left the following properties and constants out:

- rect_clip_content, I think it should let me resize the node below the content's size, but even with the minimum size set to (0,0) Godot won't let me
- mouse_filter, grow_horizontal and grow_vertical, same issue, after testing I don't know when they're necessary, so can't document them.
- GROW_DIRECTION_BEGIN, GROW_DIRECTION_END, MOUSE_FILTER_STOP, MOUSE_FILTER_PASS, MOUSE_FILTER_IGNORE, constants that correspond to the member variables above

For the mouse_filter, I couldn't see what it does in 3.0 alpha 1. For the grow_direction, I can see they might change the size calculation when the node's size changes, but in practice, with containers, I couldn't see a difference. If you know when to use it, please tell me and I'll add them to the PR.

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