Add saveable presets for GeometryNode settings

A preset menu for the overall settings of a geonode would be very convenient. I have a few nodes with a ton of settings that could lead to wildly different results depending on the input and it can be annoying going back and forth and remembering all of the settings when I want to use two or more variations. Right now id have to make all of my nodes into node groups (so any changes reflect all duplicates with changed settings) and then duplicate my node, rename it, and apply those settings, swapping between the objects as a makeshift preset.

Like one of my nodes has 10 different switches, 10 different menus and 20 different modifiable paramaters, it would be extremely convenient to save those values in place and be able to pick through a menu of presets. Would make it much easier to showcase what a geometry node can do and share them with others.