feat(util): add markdown format functions to util

[HTGAzureX1212]

Closes #2279.

This draft PR explores a potential implementation for markdown formatting functions. It is expected that the implementation would be iterated on for a bit before this is actually merged into main.

[Gelbpunkt]

Also missing spoilers and code blocks (perhaps even more that I didn't think of).

[HTGAzureX1212]

Do you think we need to add the H1, H2, H3, ... formatting?

[laralove143]

Do you think we need to add the H1, H2, H3, ... formatting?

yes, i think this should support all of discord's supported markdown, including named links and timestamps

[HTGAzureX1212]

Do you think we need to add the H1, H2, H3, ... formatting?

yes, i think this should support all of discord's supported markdown, including named links and timestamps

Promptly added.

[Gelbpunkt]

I don't think this implementation suffices. It currently has two major issues:

1. It doesn't escape properly, which IMO is the main reason to even use these helpers instead of simply wrapping the text yourself
2. It doesn't handle multi-line text properly for some cases like block quotes, where each line needs to be prepended individually

[HTGAzureX1212]

I'll look into those