feat: Dynamically import prism langs

[nicholas-codecov]

          just some food for thought: is it possible to load these on-demand after matching the file extension?

its also weird that you are using require here instead of bare import statements. is there a particular reason for that?

Originally posted by @Swatinem in codecov/gazebo#3138 (comment)

[nicholas-codecov]

Dove a bit deeper into this, and it's possible but not really in a clean way. As well another thing to consider after chatting w/@JonasBa, this is a fairly core dependency to Gazebo, so we're alright with the tradeoff of everything being loading all the time.

Other things have been done to remove overall bundle size, such as optimizing our SVGs which offset overall the overall bundle size.