434 leetcode for codey

[mcpenguin]

Summary of Changes

Added commands for leetcode:

.leetcode / .leetcode random [difficulty] [tag] -> Generates a random Leetcode problem with an optional filter for difficulty and tag.
.leetcode specific [problem id] -> Generates a Leetcode problem with specified ID.

Motivation and Explanation

Leetcode Bot became broken - this functionality should replace it.

Related Issues

Resolves #434

Steps to Reproduce

Use the commands specified above.

Demonstration of Changes

Further Information and Comments

• The Leetcode "API" might take longer than 3 seconds to run, which is the timeout for slash commands. So, instead of sending the problem via the original command, we send it as a followup message using the afterMessageReply functionality.
• The command is significantly faster for a search for a random problem or by a specific id compared to using filters.

[Picowchew]

I left some comments.

[Picowchew]

Would we want to send multiple messages instead of just truncating the message?

[mcpenguin]

Sending multiple messages might look weird if the truncation occurs in a weird spot, eg in the middle of a word.

[Picowchew]

That is fair. I guess it might potentially mess up code blocks and equations as well, in which it might be more effort than what it is worth to detect them.

[Picowchew]

LGTM!