Overview: What does this pull request change?

Motivation and Explanation: Why and how do your changes improve the library?

The current OpenGLSurface, when input a colorscale and axes, lag when rotating and moving the camera. This is because the surface recalculates the colors to each point on every frame. This PR stores the color data to be reused every frame.

This was the test Scene used:

from manim import *
from manim.opengl import *


class Test(Scene):
    def construct(self):
        s = OpenGLSurface(
            lambda u, v: np.array([u, v, u * v]),
            [-2, 2],
            [-2, 2],
            colorscale=(PURE_BLUE, PURE_RED),
            axes=ThreeDAxes(),
        )
        self.add(s)
        self.interactive_embed()

Links to added or changed documentation pages

Further Information and Comments

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested