Remove and deprecate cythonised sprite module

[MyreMylar]

fixes #2342

Motivation:
After PR #2533 the normal sprite submodule's Group.draw() call is faster than the current cythonised sprite submodule, having a second cython-version of the sprite submodule is an additional pain to maintain. The general approach we are transitioning towards in pygame-ce is to use the C extension API where it helps with performance and keep other stuff in pure python where we can leverage the performance work of the CPython team - this is going to mean the gradual elimination of the current middle layer that is our Cython code.

Maintenance is the biggest hurdle in keeping most open source projects going and hopefully this is one tiny step in making pygame-ce a little bit easier to mainatain.

[MyreMylar]

This was the performance test code I was using:

import timeit

time_taken = timeit.timeit(
    "draw_sprites(display_surf, test_sprite_group)",
    setup="import pygame\n\n"
    "pygame.init()\n\n"
    "display_surf = pygame.display.set_mode((800, 600))\n\n"
    "test_sprite_group = pygame.sprite.Group()\n\n"
    "for i in range(300):\n"
    "   test_sprite = pygame.sprite.Sprite(test_sprite_group)\n"
    "   test_sprite.image = pygame.Surface((64,64))\n"
    "   test_sprite.image.fill('red')\n"
    "   test_sprite.rect = pygame.Rect((i*2,i*2), (64, 64))\n"
    "def draw_sprites(display_surface, sprite_group):\n"
    "    display_surface.fill((255, 255, 255))\n"
    "    sprite_group.draw(display_surface)\n"
    "    pygame.display.flip()\n",
    number=1000,
)
print("time taken to do 1000 warm-up sprite draws (don't count these as perf takes a while to warm up)", time_taken)


time_taken = timeit.timeit(
    "draw_sprites(display_surf, test_sprite_group)",
    setup="import pygame\n"
    "import pygame._sprite\n\n"
    "pygame.init()\n\n"
    "display_surf = pygame.display.set_mode((800, 600))\n\n"
    "test_sprite_group = pygame._sprite.Group()\n\n"
    "for i in range(300):\n"
    "   test_sprite = pygame._sprite.Sprite(test_sprite_group)\n"
    "   test_sprite.image = pygame.Surface((64,64))\n"
    "   test_sprite.image.fill('red')\n"
    "   test_sprite.rect = pygame.Rect((i*2,i*2), (64, 64))\n"
    "def draw_sprites(display_surface, sprite_group):\n"
    "    display_surface.fill((255, 255, 255))\n"
    "    sprite_group.draw(display_surface)\n"
    "    pygame.display.flip()\n",
    number=1000,
)
print("time taken to do 1000 cython sprite draws", time_taken)

time_taken = timeit.timeit(
    "draw_sprites(display_surf, test_sprite_group)",
    setup="import pygame\n\n"
    "pygame.init()\n\n"
    "display_surf = pygame.display.set_mode((800, 600))\n\n"
    "test_sprite_group = pygame.sprite.Group()\n\n"
    "for i in range(300):\n"
    "   test_sprite = pygame.sprite.Sprite(test_sprite_group)\n"
    "   test_sprite.image = pygame.Surface((64,64))\n"
    "   test_sprite.image.fill('red')\n"
    "   test_sprite.rect = pygame.Rect((i*2,i*2), (64, 64))\n"
    "def draw_sprites(display_surface, sprite_group):\n"
    "    display_surface.fill((255, 255, 255))\n"
    "    sprite_group.draw(display_surface)\n"
    "    pygame.display.flip()\n",
    number=1000,
)
print("time taken to do 1000 sprite draws", time_taken)

On current main the cython sprite module slightly outperforms the normal sprite module in drawing, but when I try it with the newly optimised sprite module in #2533 the normal sprite is now better than cython sprite.

[Starbuck5]

I'm good to see this removed, I like that you've justified this with performance and maintainability, and I concur.

[Starbuck5]

Another bonus of this is that it makes the installed wheel smaller since it doesn't have the _sprite object. For me it's a 300kb difference.

[ankith26]

LGTM, thanks for the PR! Seeing 44k lines being removed is always a nice feeling