Kernel: Implement USB Keyboard

This is kinda hacky, as I had disable the PS/2 initialization so that
usb keyboard gets /dev/keyboard0. I should add device hot plugging
support for TTY and GUI...

kernel/include/kernel/USB/HID/Keyboard.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <kernel/USB/HID/HIDDriver.h>
+
+namespace Kernel
+{
+
+	class USBKeyboard final : public USBHIDDevice
+	{
+		BAN_NON_COPYABLE(USBKeyboard);
+		BAN_NON_MOVABLE(USBKeyboard);
+
+	public:
+		void start_report() override;
+		void stop_report() override;
+
+		void handle_variable(uint16_t usage_page, uint16_t usage, int64_t state) override;
+		void handle_array(uint16_t usage_page, uint16_t usage) override;
+
+	private:
+		USBKeyboard()
+			: USBHIDDevice(InputDevice::Type::Keyboard)
+		{}
+		~USBKeyboard() = default;
+
+	private:
+		BAN::Array<bool, 0x100> m_keyboard_state      { false };
+		BAN::Array<bool, 0x100> m_keyboard_state_temp { false };
+		uint8_t m_toggle_mask { 0 };
+
+		friend class BAN::RefPtr<USBKeyboard>;
+	};
+
+}