[gp8403] Add gp8413 (15 bits) DAC model (#7726)

Co-authored-by: Djordje Mandic <6750655+DjordjeMandic@users.noreply.github.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

tests/components/gp8403/common.yaml

@@ -4,6 +4,11 @@ gp8403:
     voltage: 5V
   - id: gp8403_10v
     i2c_id: i2c_bus
+    model: GP8403
+    voltage: 10V
+  - id: gp8413
+    i2c_id: i2c_bus
+    model: GP8413
     voltage: 10V
 
 output:
@@ -15,3 +20,7 @@ output:
     gp8403_id: gp8403_10v
     id: gp8403_output_1
     channel: 1
+  - platform: gp8403
+    gp8403_id: gp8413
+    id: gp8413_output_2
+    channel: 1