Add new userspace component for PoKeys

[zarfld]

Related to #25

Create a new modular userspace component for PoKeys in the pokeys_userspace subfolder.

• pokeys_userspace/pokeys_analog_io.comp

  • Implement analog IO component for PoKeys.
  • Define pins for analog input and output.
  • Connect to PoKeys device and read/write analog values.

• pokeys_userspace/pokeys_digital_io.comp

  • Implement digital IO component for PoKeys.
  • Define pins for digital input and output.
  • Connect to PoKeys device and read/write digital values.

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For more details, open the Copilot Workspace session.