Add clear method to Graphics2D interface for viewport clearing

Introduced a clear(math.Color color) method in the Graphics2D interface.
The method allows clearing the entire viewport with a specified color,
resetting the drawing surface.
Useful for initializing or refreshing the rendering context during
updates.

Author: ArtifactForms

src/main/java/workspace/GraphicsPImpl.java

@@ -550,4 +550,9 @@ public void drawImage(Image image, float x, float y, float width, float height)
       throw new IllegalArgumentException("Unsupported image backend.");
     }
   }
+
+  @Override
+  public void clear(math.Color color) {
+    g.background(color.getRedInt(), color.getGreenInt(), color.getBlueInt(), color.getAlphaInt());
+  }
 }

src/main/java/workspace/ui/Graphics2D.java

@@ -226,6 +226,17 @@ public interface Graphics2D {
    */
   void text(String text, float x, float y);
 
+  /**
+   * Clears the rendering context with the specified color.
+   *
+   * <p>This method fills the entire viewport with the provided color, effectively resetting the
+   * drawing surface to a blank state. Any previously drawn content is overwritten.
+   *
+   * @param color The {@link math.Color} to use for clearing the viewport. The color is applied
+   *     uniformly across the entire rendering surface.
+   */
+  void clear(math.Color color);
+
   void drawImage(Image image, float x, float y);
 
   void drawImage(Image image, float x, float y, float width, float height);