[Keyboard] Melgeek MJ64 (#10425)

* [Keyboard] Support MJ64 which is a 60% Hotswap RGB keyboard with arrows
and the size of left shift is 2.25U

* Update keyboards/melgeek/mj64/mj64.h

* Update keyboards/melgeek/mj64/keymaps/default/keymap.c

* Update keyboards/melgeek/mj64/keymaps/via/keymap.c

* Update keyboards/melgeek/mj64/keymaps/via/keymap.c

* Update keyboards/melgeek/mj64/keymaps/default/keymap.c

* Update keyboards/melgeek/mj64/keymaps/via/keymap.c

* Update keyboards/melgeek/mj64/rev2/rules.mk

* Update keyboards/melgeek/mj64/rev1/rules.mk

* Update keyboards/melgeek/mj64/keymaps/via/keymap.c

* Update keyboards/melgeek/mj64/info.json

* Update keyboards/melgeek/mj64/info.json

* Update keyboards/melgeek/mj64/rev1/config.h

* Update keyboards/melgeek/mj64/rev2/config.h

* Update the VID and PID in mj64/config.h
add the rev1/rev1.c
add the rev2/rev2.c

keyboards/melgeek/mj64/rev1/rules.mk

@@ -0,0 +1,22 @@
+# MCU name
+MCU = STM32F303
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite        # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = yes          # Mouse keys
+EXTRAKEY_ENABLE = yes          # Audio control and System control
+CONSOLE_ENABLE = no            # Console for debug
+COMMAND_ENABLE = no            # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no          # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = yes              # USB Nkey Rollover
+BACKLIGHT_ENABLE = no          # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no           # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no          # Enable Bluetooth
+RGB_MATRIX_ENABLE = IS31FL3741 # Use RGB matrix
+NO_USB_STARTUP_CHECK = no      # Disable initialization only when usb is plugged in
+
+LAYOUTS = 64_ansi