Document Qt Quick 3D Effects

Add a topic that documents the properties of the Qt Quick 3D Effects to the "Using 3D Components" section.

The documentation for the Qt Quick 3D Effects module can be used as a starting point:

https://doc.qt.io/qt-5/qtquick3d-effects-qmlmodule.html

The effect types mostly have only a few properties, so you could consider documenting them in a table, or as short subsection of a new topic called "Applying 3D Effects" (or something like that) that would be linked from here: https://doc-snapshots.qt.io/qtdesignstudio-4.13/studio-3d-components.html

Note that the Manual already contains a section about 2D visual effects: https://doc-snapshots.qt.io/qtdesignstudio-4.13/quick-components.html#applying-visual-effects

It contains a table with short descriptions and links to the module documentation of the QML types.