feat: Add latex rendering

[brenapp]

Is your feature request related to a problem? Please describe.
Having the ability to succinctly add equations can be incredibly useful for discussions, especially for more math-intensive courses.

Describe the solution you'd like
Add a command to display tex equations.

Reference Implementation
The simplest way to do this would be to rely on an online service like codecogs. I did this in my bot. The slightly better/more fancy version of this image would be to download the generated image, and then upload it so the URL doesn't display.
https://github.com/MayorMonty/vexbot/blob/master/src/commands/latex.ts

Example invocation

[Jay-Madden]

This is an amazing idea, what are the rate limits like for that site?

[brenapp]

I have not encountered any for mine, so as long as we are responsible, and enforce reasonable rate limits on our end, it isn't an issue.

[Jay-Madden]

gotcha, ya seems to be relatively simple. Is this something you would like to add or are you just leaving the suggestion?

[zepthro]

If there is an api, it seems simple enough. Have you researched the subject? @MayorMonty

For @Jay-Madden's rate limit problem, we could add a call back function? That way the bot doesn't get stuck on one person's code.

[Jay-Madden]

Rate limits won't hang the bot, it'll just be a different response. Due to how async works every command is a seperate thing so one call hanging or being rate limited wont effect the bot itself

[brenapp]

The service does not enforce rate limits, as far as I can tell. We should be respectful of it, and only allow the command to execute every few seconds (5 is probably more than reasonable), and we should be fine