Added items and ability as gen data + updated data

[AlexAuragan]

I wanted to have at least the list of items and abilities for vectorization of observable data for machine learning. I added scripts/update_items.py and scripts/update_abilities.py with the same format as the other update script.

I think the helper function data_script_utils.py > fetch_and_clean_ps_data() was not working properly on these data but also in moves.py, with the help of LLM I could tweak the regex a bit to have it work on everything currently online.

I also ran update_all_data.py to update all the data

FYI I'm not yet 100% familiar with everything in the poke-env and showdown ecosystem. In the item data many items have the inherit attribute, Idk if it's related their effect or if it's just a coding artifact that we should get rid of since it doesn't concern the ed user.