Add support for JJ40

[alvaromuente]

Adding support to the JJ40, and all of its possible layouts (grid, mit, each 2u or 2x2u)

Description

QMK Pull Request

qmk/qmk_firmware#10263

Checklist

• The QMK source code follows the guide here: https://caniusevia.com/docs/configuring_qmk
• The VIA definition follows the guide here: https://caniusevia.com/docs/layouts
• 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