Add Binepad BNK8

[silvinor]

Description

Add Binepad BNK8

QMK Pull Request

• #24598

VIA Keymap Pull Request

• #36

Checklist

• VIA keymap is MERGED in VIA userspace master already (MANDATORY)
• The VIA definition follows the guide here: https://caniusevia.com/docs/layouts
• I have a V3 JSON version for this keyboard definition.(MANDATORY)
• I have formatted the JSON file to have consistent formatting with the rest of the repository.
• 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

[Cipulot]

@silvinor in the waiting room until the PR the-via/qmk_userspace_via#36 adds the code handling for the custom UI elements.
Also, could you pull and apply the suggested formatting? for some reason, I can't force the commit myself.