Blackjack Leaderboards Functionality

[sagarpatel211]

Summary of Changes

• This ticket addresses the implementation for a Blackjack leaderboards function.

Motivation and Explanation

• This feature improve the bot as it expands functionality by displaying a Leaderboards for game Blackjack

Related Issues

• Resolves Add blackjack leaderboards #264

Steps to Reproduce

• Run the Discord bot and checkout to leaderboard-helper
• Call .bjlb t or .bjlb wr in your test channel to try it out

Demonstration of Changes

• bjlb t to check the Blackjack total coins earned leaderboard
• .bjlb wr to check the Blackjack winrate leaderboard

Further Information and Comments

• Let me know if there's any changes I can make or improvements in my code style, documentation, etc.!

[davidgan1218]

1. Negative Coin Issue on Blackjack
2. Winrate Leaderboard should be 0% instead of N/A if you have no wins.