ports/rp2/boards/ADAFRUIT_KB2040: Add Adafruit KB2040 board.

ports/rp2/boards/ADAFRUIT_KB2040/board.json

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+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "Breadboard Friendly",
+        "Castellated Pads",
+        "RGB LED",
+        "SPI Flash",
+        "STEMMA QT/QWIIC",
+        "USB-C",
+        "Pink"
+    ],
+    "images": [
+        "5302-12.jpg"
+    ],
+    "mcu": "rp2040",
+    "product": "KB2040",
+    "thumbnail": "",
+    "url": "https://www.adafruit.com/product/5302",
+    "vendor": "Adafruit"
+}

ports/rp2/boards/ADAFRUIT_KB2040/mpconfigboard.cmake

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+# cmake file for Adafruit KB2040
+

ports/rp2/boards/ADAFRUIT_KB2040/mpconfigboard.h

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+// https://www.adafruit.com/product/5302
+// https://learn.adafruit.com/adafruit-kb2040/pinouts
+
+#define MICROPY_HW_BOARD_NAME          "Adafruit KB2040"
+#define MICROPY_HW_FLASH_STORAGE_BYTES (7 * 1024 * 1024)
+
+#define MICROPY_HW_USB_VID (0x239A)
+#define MICROPY_HW_USB_PID (0x8106)
+
+// Boot Button   GPIO11
+// Neopixel data GPIO17