Add ABGR format to frombytes and tobytes

[zoldalma999]

Fixes #1783
The C code for frombytes and tobytes could be cleaned up, but I'll leave that for another PR.

[ankith26]

LGTM, thanks for the PR 🎉

[ankith26]

the code do be needing some cleaning

[damusss]

LGTM, I tested locally and the original image stays perfect, using this code

import pygame
pygame.display.init()
pygame.display.set_mode((10, 10))
img = pygame.image.load("../bg.jpg").convert_alpha()

with open("../out.idk", "wb") as file:
    file.write(pygame.image.tobytes(img, "ABGR"))

with open("../out.idk", "rb") as file:
    b = file.read()
    newimg = pygame.image.frombytes(b, img.size, "ABGR")
    pygame.image.save(newimg, "../fromout.png")