Add Binepad PIXIE

[silvinor]

Description

Adding Binepad PIXIE keyboard, an RP2040 based 2x2 macro keypad featuring 2 rotary encoders and 2 macro buttons.

QMK Pull Request

• [Keyboard] Add Binepad Pixie qmk/qmk_firmware#21524

Checklist

• The VIA support for this keyboard is MERGED in QMK master already (MANDATORY)
• The VIA definition follows the guide here: https://caniusevia.com/docs/layouts
• I have a V3 JSON version for this keyboard definition.(MANDATORY)
• I have tested this keyboard definition using VIA's "Design" tab.
• I have tested this keyboard definition with firmware on a device.
• I have assigned alpha keys and modifier keys with the correct colors.
• The Vendor ID is not 0xFEED