feat(hid): Add preprocessor definitions for HID usages v1.21

Developed from specification:
https://usb.org/sites/default/files/hut1_21.pdf

Closes #217.  Prerequisite of #21.

app/include/dt-bindings/zmk/hid_usage_pages.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Based on HID Usage Tables 1.21,
+ * Copyright © 1996-2020, USB Implementers Forum,
+ * https://www.usb.org/sites/default/files/hut1_21.pdf
+ */
+
+#pragma once
+
+#define HID_USAGE_GD (0x01)             // Generic Desktop
+#define HID_USAGE_SIM (0x02)            // Simulation Controls
+#define HID_USAGE_VR (0x03)             // VR Controls
+#define HID_USAGE_SPORT (0x04)          // Sport Controls
+#define HID_USAGE_GAME (0x05)           // Game Controls
+#define HID_USAGE_GDV (0x06)            // Generic Device Controls
+#define HID_USAGE_KEY (0x07)            // Keyboard/Keypad
+#define HID_USAGE_LED (0x08)            // LED
+#define HID_USAGE_TELEPHONY (0x0B)      // Telephony Device
+#define HID_USAGE_CONSUMER (0x0C)       // Consumer
+#define HID_USAGE_DIGITIZERS (0x0D)     // Digitizers
+#define HID_USAGE_HAPTICS (0x0E)        // Haptics
+#define HID_USAGE_PID (0x0F)            // PID
+#define HID_USAGE_EHT (0x12)            // Eye and Head Trackers
+#define HID_USAGE_AUXDISP (0x14)        // Auxiliary Display
+#define HID_USAGE_SENSORS (0x20)        // Sensors
+#define HID_USAGE_MEDICAL (0x40)        // Medical Instrument
+#define HID_USAGE_BRAILLE (0x41)        // Braille Display
+#define HID_USAGE_LIGHT (0x59)          // Lighting And Illumination
+#define HID_USAGE_MONITOR (0x80)        // USB Monitor
+#define HID_USAGE_MONITOR_VALUES (0x81) // Monitor Enumerated Values
+#define HID_USAGE_MONITOR_VESA (0x82)   // VESA Virtual Control
+#define HID_USAGE_POWER (0x84)          // Power
+#define HID_USAGE_POS_BARCODE (0x8C)    // Bar Code Scanner
+#define HID_USAGE_POS_SCALE (0x8D)      // Scale
+#define HID_USAGE_POS_MSR (0x8E)        // Magnetic Stripe Reading (MSR) Devices
+#define HID_USAGE_POS_RESV (0x8F)       // Reserved Point of Sale
+#define HID_USAGE_CAMERA (0x90)         // Camera Control
+#define HID_USAGE_ARCADE (0x91)         // Arcade
+#define HID_USAGE_GAMING (0x92)         // Gaming Device
+#define HID_USAGE_FIDO (0xF1D0)         // FIDO Alliance