Add Sinc Rev. 3 and Update Rev 1-2

[nooges]

Description

• Add Sinc Rev. 3
• Add support for encoder mapping to Sinc Rev. 1 and 2

QMK Pull Request

• Add Sinc Rev. 3 qmk/qmk_firmware#18846
• Add Sinc Rev. 1-2 Encoder Map qmk/qmk_firmware#18861

Checklist

• The VIA support for this keyboard is in QMK master already (MANDATORY)
• 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

[Xelus22]

LGTM. Thanks!