Add geekboards macropad_v2

[ruddy17]

Description

Via configs for Geekboards Macropad V2, 8-keys macropad with RGB lighting

QMK Pull Request

qmk/qmk_firmware#11045

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

[ruddy17]

Demo
https://www.youtube.com/watch?v=Sy0ZG9p_KW0

[ruddy17]

Please, check this PR in QMK: qmk/qmk_firmware#11084
Now, as it is merged, it is possible to use VIA with QMK's RGB matrix effects. For current VIA it requires some manual extensions in json config, as seen in my PR. I suggest VIA devs to implement "lighting":"qmk_rgb_matrix" option, so it integrates more seamlessly. The changes required are effect names and effect speed value range of 0..255 instead of current 0..3

[wilba]

I will merge this now, but it will require refactoring after the custom menus/UI is rolled out, i.e. after QMK's RGB matrix is properly supported in VIA through custom menus/UI.

[ruddy17]

Thank you. I'll be first in the line to pr the refactor :)