Make 2 player RPS

[mcpenguin]

Description of proposed feature

The second version of RPS we can make would be 2-player, with the command structure being .rps [bet amount] [player to challenge]. If no player is provided, it defaults to the single player option. Codey would then send a message with the content

@playerChallenged has challenged you to a game of RPS with a bet of :codeyCoin:! Do you accept their challenge?
[ accept ][ reject ]

If reject is clicked, nothing happens. If accept is clicked, an embed now shows up similar to the single player version. But this time, Codey waits for both of them to react/click their option, with a 5 second timeout. If one player fails to click within the time limit, half of their bet is forfeited. After both players have clicked their option, the hands of both players are revealed, and the pool is split accordingly.

How can the new feature be used?

.rps [bet] [player to challenge]. If player to challenge is omitted, single player RPS is played.