Madlibs - Add "End Game" and "Choose for me" buttons

[DMFriends]

Relevant Issues

Closes #1000

Description

• Added an "End Game" button to end the game in case a user decides not to play after starting a game.
• Added a "Choose for me" button that randomly chooses a word from the madlibs_word_bank.json file and adds it to the Madlib in case the user can't think of a good word to use for the given part of speech.
• As I was writing the code for the "Choose for me" button, I realized that it wouldn't make sense not to add a cooldown for the button so the user cannot spam it, so I added that as well, although it wasn't part of my original proposal in the issue.
• Also not part of the original issue but changed the timeout from 60 seconds to 120 seconds because 60 seconds felt too short to me.
• Had to also make a few minor changes to the original implementation of the game (which I wrote) to make it work with the new buttons.

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