add gameShark api

[daivikbhatia]

#286 Added support for GameShark API

• Created two new files in the API directory: gameshark.py and gameshark.pdx.
• Added a run_cheats() function that can be called from PyBoy using pyboy.gameshark.run_cheats(cheat, _is_path).
• Introduced an _is_path flag in the run_cheats() function:
  • If _is_path is True, cheat must be a path to a text file containing cheats.
  • If _is_path is False, cheat can be passed directly as a string.

Example Usage:

from pyboy import PyBoy
pyboy = PyBoy("./red.gb")
while pyboy.tick():
    pyboy.gameshark.run_cheats("010138CD",_is_path=False)
    pass
pyboy.stop()

[Baekalfen]

Is the cheats file a commonly used format for GameShark cheats?

Otherwise, I'm thinking to just have the API apply one at a time from a string (_is_path=False) and remove this complexity. The end-user can easily implement this on their own.

[Baekalfen]

Also, I don't use these cheats myself. Could you add a tests/test_gameshark.py?

[daivikbhatia]

Is the cheats file a commonly used format for GameShark cheats?

Otherwise, I'm thinking to just have the API apply one at a time from a string (_is_path=False) and remove this complexity. The end-user can easily implement this on their own.

The cheat file is not commonly used. Usually cheats are entered from the emulator interface iteself. I kept cheat file option because it was their in codebase I referred. It would totally make sense to remove it and have the string functionality only.
I will remove it.

[Baekalfen]

Superseded by #345. Thank you so much for the initial work! It's still the basis of the other PR.