Add Sinc Rev. 3 (#18846)

* Initial work on adding Sinc Rev. 3

* Add RGB Matrix support

* Add encoder map support

* Set I2C pins

* Update LED locations for right half

* Move USB definitions to info.json

* Update RGB modes

* Replace pin mappings for right half with correct ones

* Move config.h back to rev1/rev2 due to addition of rev3

* Convert initial Rev. 3 config work to be data-driven

* Convert RGB Matrix config to DD format

* More config cleanup

* Use full-duplex PIO

* Add MCU/bootloader settings for Rev. 2

* Change ISO Enter location since it shares location with Backslash

* Adjust build settings to reduce flash/EEPROM usage

keyboards/keebio/sinc/sinc.h

@@ -23,3 +23,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef KEYBOARD_keebio_sinc_rev2
     #include "rev2.h"
 #endif
+#ifdef KEYBOARD_keebio_sinc_rev3
+    #include "rev3.h"
+#endif