Drivers Strings support

Now that GeometryNodes have ✨String Nodes✨, it would be great to drive them with drivers as we already do with numbers (floats).

For example getting the name of the current Object or View Layer (via a 'Context Property') which would be amazing for procedural and pipeline tools without having to write a bunch of python to overcome this.

Illustration:

(green) Currently working driver expression (but with a hard coded 'digit' operation) depsgraph.view_layer.name == "ViewLayer"

(blue) Enabling Drivers support for Strings would allow to store strings in variables ex: current_view_layer_name == "ViewLayer"

(red) Drivers support for String would allow versatile usage with the quickly improving String Nodes ex: current_view_layer_name