[XAP] add binding for lighting subsystem

[tzarc]

XAP Task Info

Original Issue
Original spec document
Current XAP Definitions
Current XAP Generated Docs
Placeholder PR

Description

Any work in this area needs to be discussed with QMK Collaborators first.

Add support for routes to exercise the lighting subsystem, surpassing VIA capabilities.

• See if we should converge the two under a single "Lighting" subsystem
• Perhaps just drop rgblight for XAP, require rgb_matrix for compatibility?
• Discuss requirements with OpenRGB folks
  • e.g. "zones" and/or other extra data definitions that they'd find useful
  • May need to amend rgb_matrix definitions to support new info (another reason to drop rgblight, here)

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