chore: add script to generate nerd-fonts v3 icon list

[Snxwman]

I've written a bash script that extracts all the nerd-fonts icons and names from the nerd-fonts repo and generates a lua file that contains the icon list. This generated file is the same as the previous nf-v3-icon-list.lua, just with the updated names and icons.

I've done my best to comment the script so it is overly clear what the script does.

This script will allow you to regenerate the nf-v3-icon-list.lua file every time nerd-fonts releases a new version that adds or changes icons.

The script is a bit slow (takes about 35 seconds on my desktop) due to how many icons there are (currently about 9200), but only needs to be run once each time nerd-fonts updates their version. It could probably be made faster, but for how infrequently it needs to be run, I don't think it matters much.

[ziontee113]

Thank you so much @Snxwman for the PR. Since the script is very descriptive it'd be a breeze in the future to adapt to new Nerd Fonts versions. Thank you 👍