Add bezier from gfxdraw module to draw module

[bilhox]

Hello, as part of #3005 plan, this PR moves pygame.gfxdraw.bezier to pygame.draw.bezier.

[damusss]

This note is outdated.

[MyreMylar]

OK, LGTM. Bezier works as expected under the draw module instead of gfxdraw in my testing. the tests all pass locally as well.

Test program:

import pygame

pygame.init()

sf = pygame.display.set_mode((640, 480))

font = pygame.font.Font(size=36)

points = []

STEPS = 3

print("Click on the screen to put points.")

while 1:
    for event in pygame.event.get():
        if event.type == pygame.MOUSEBUTTONDOWN:
            points.append(event.pos)
    sf.fill((0, 0, 0))

    for p in points:
        pygame.draw.circle(sf, (255, 0, 0), p, 5)

    if len(points) > 2:
        pygame.draw.lines(sf, (255, 0, 0), False, points)
        pygame.draw.bezier(sf, points, STEPS, (255, 255, 255))

    test = f"Points: {len(points)}\nSteps: {STEPS}"
    text_sf = font.render(test, True, (255, 255, 255))
    sf.blit(text_sf, (10, 400))

    pygame.display.update()

[bilhox]

I would like to know your opinion about the step argument before potentially merging it. I think personally the docs are not clear at all about step argument, and when I tested it with different values, I couldn't really figure out how it was used. Furthermore the code is not that great to read (I first look the variable names are not understandable), which is why I support the idea of a new implementation of Bézier curves so I can also document the terrible code.