typedoc does not handle shiki language aliases

[StoneCypher]

Expected Behavior

typedoc should understand language aliases.

Many languages in shiki have aliases. At this time typedoc believes that these aliases are "fakes" and manually handles the five for typescript-as-ts, javascript-as-js, and shell-as-[sh, bash, zsh] in creating the supported language list.

Shiki offers an aliases field which should be walked instead. Many other aliases, such as ruby-as-rb, python-as-py, jssm-as-fsl and so on are being missed, and the ones being manually loaded become unnecessary.

Actual Behavior

typedoc does not understand language aliases, except the five manually added to the list.

Steps to reproduce the bug

Attempt to highlight the following two blocks.

\```ruby
puts "this will work";
\```

\```rb
puts "this will not work, but should";
\```

Note: that backslash shouldn't be there, I just don't know how to quote a triple tick in a fence block

PR incoming

Environment

• Typedoc version: 0.21.8
• TypeScript version: irrelevant
• Node.js version: irrelevant
• OS: irrelevant

[Gerrit0]

So that's where those are defined! I figured they must be listed somewhere, but never ended up discovering where.