Added grid_lines attribute to Rectangle to add individual styling to the grid lines

manim/mobject/geometry/polygram.py

@@ -577,6 +577,8 @@ class Rectangle(Polygon):
         No purpose.
     close_new_points
         No purpose.
+    grid_line_stroke_width
+        Stroke width of grid lines.
     kwargs
         Additional arguments to be passed to :class:`Polygon`
 
@@ -589,8 +591,9 @@ class RectangleExample(Scene):
             def construct(self):
                 rect1 = Rectangle(width=4.0, height=2.0, grid_xstep=1.0, grid_ystep=0.5)
                 rect2 = Rectangle(width=1.0, height=4.0)
+                rect3 = Rectangle(width=2.0, height=2.0, grid_xstep=1.0, grid_ystep=1.0, grid_line_stroke_width=1)
 
-                rects = Group(rect1,rect2).arrange(buff=1)
+                rects = Group(rect1, rect2, rect3).arrange(buff=1)
                 self.add(rects)
     """
 
@@ -603,6 +606,7 @@ def __init__(
         grid_ystep: float | None = None,
         mark_paths_closed: bool = True,
         close_new_points: bool = True,
+        grid_line_stroke_width: int = DEFAULT_STROKE_WIDTH,
         **kwargs,
     ):
         super().__init__(UR, UL, DL, DR, color=color, **kwargs)
@@ -620,6 +624,7 @@ def __init__(
                         v[1] + i * grid_xstep * RIGHT,
                         v[1] + i * grid_xstep * RIGHT + height * DOWN,
                         color=color,
+                        stroke_width=grid_line_stroke_width,
                     )
                     for i in range(1, count)
                 )
@@ -634,6 +639,7 @@ def __init__(
                         v[1] + i * grid_ystep * DOWN,
                         v[1] + i * grid_ystep * DOWN + width * RIGHT,
                         color=color,
+                        stroke_width=grid_line_stroke_width,
                     )
                     for i in range(1, count)
                 )