Add support for Cubicon xCeler-Plus printer and profiles. (#11771)

# Description
This PR adds support for the new printer model **Cubicon xCeler-Plus**.
It includes:
- Machine configuration (JSON)
- Process profiles (Speed, Quality settings)
- Filament settings
- Bed texture and model resources

# Screenshots/Recordings/Graphs
# Tests
I have successfully tested the sliced G-code on the actual machine (Cubicon xCeler-Plus).
- [x] Slicing test passed
- [x] Printing test passed with Klipper firmware

resources/profiles/Cubicon/machine/Cubicon xCeler-Plus.json

@@ -0,0 +1,10 @@
+{
+    "type": "machine_model",
+    "name": "Cubicon xCeler-Plus",
+    "nozzle_diameter": "0.4",
+    "bed_model": "",
+    "bed_texture": "Cubicon xCeler-I_bed_texture.svg",
+    "family": "Cubicon",
+    "machine_tech": "FFF",
+    "default_materials": "Cubicon PLA @Cubicon xCeler-Plus"
+}