Add missing functionalities to pokeys_userspace

[zarfld]

Related to #28

Add missing functionalities to pokeys_userspace to match pokeys.comp.

• PWM Functionality:

  • Add pokeys_userspace/pokeys_pwm.comp to implement PWM functionality.
  • Include pin setup for PWM channels.
  • Include main loop to fetch and set PWM values.
  • Connect to PoKeys device in rtapi_app_main.
  • Disconnect from PoKeys device in rtapi_app_exit.

• PoExtBus Functionality:

  • Add pokeys_userspace/pokeys_poextbus.comp to implement PoExtBus functionality.
  • Include pin setup for PoExtBus channels.
  • Include main loop to fetch and set PoExtBus values.
  • Connect to PoKeys device in rtapi_app_main.
  • Disconnect from PoKeys device in rtapi_app_exit.

• PoRelay8 Functionality:

  • Add pokeys_userspace/pokeys_porelay8.comp to implement PoRelay8 functionality.
  • Include pin setup for PoRelay8 channels.
  • Include main loop to fetch and set PoRelay8 values.
  • Connect to PoKeys device in rtapi_app_main.
  • Disconnect from PoKeys device in rtapi_app_exit.

• PoNETkbd48CNC Functionality:

  • Add pokeys_userspace/pokeys_ponetkbd48cnc.comp to implement PoNETkbd48CNC functionality.
  • Include pin setup for PoNETkbd48CNC channels.
  • Include main loop to fetch and set PoNETkbd48CNC values.
  • Connect to PoKeys device in rtapi_app_main.
  • Disconnect from PoKeys device in rtapi_app_exit.

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For more details, open the Copilot Workspace session.