Re-think gradient application to base and stroke

Describe the problem

Right now, the Graphics Tools/Standard and Graphics Tools/Standard Canvas shaders apply base colors/gradients and strokes (border lights) using paradigms convenient to HoloLens 1 and 2 but are not very flexible.

Describe the solution you'd like

We should spend some time to reevaluate how base colors and stokes are selected/enabled/disabled. This will take some refactoring of the shader code and inspector. This might even be a good opportunity to add shader graph nodes for these effects.

Describe alternatives you've considered

Live with the existing workflow.

Additional context

See how stoke gradients are currently hidden in the UI:

Comienza localizando los shaders Graphics Tools/Standard y Graphics Tools/Standard Canvas; después, inspecciona su código de shader y la UI del inspector relacionada. Revisa cómo se seleccionan y habilitan o deshabilitan los colores base, los degradados y los trazos, incluidos los controles de degradado de trazo que actualmente están ocultos. Se considera terminado cuando el flujo de trabajo refactorizado y el comportamiento del inspector estén definidos e implementados, y se haya evaluado cualquier oportunidad de usar un nodo de shader graph.