Add method to set the History TTL by AkkiaS7 · Pull Request #1384 · pyrogram/pyrogram

`app.set_history_ttl(chat_id, period)` to automatically delete messages
after either a day or a week. 0 to disable.

`set_history_ttl` -> `set_chat_history_ttl` in all occurences

(Still the original name ha!)

# Conflicts:
#	pyrogram/methods/chats/__init__.py
#	pyrogram/types/messages_and_media/message.py
#	pyrogram/types/user_and_chats/chat.py