Add "jsonc" alias

[cpfeiffer]

          @glen-84 Would you be happier if we added a "jsonc" alias?

Originally posted by @joshgoebel in #2016 (comment)

rouge and shiki support jsonc as identifier, so it would be nice to have this in highlightjs as well.

See

• https://shiki.style/languages
• Support JSON With Comments rouge-ruby/rouge#1028

[joshgoebel]

Sounds reasonable.

[BackupMiles]

Hi! Can this issue be assigned to me?

[joshgoebel]

Just make a PR - people aren't rushing in huge lines to complete these issues. :)

[BackupMiles]

Sure will! Thank you :D

[BackupMiles]

Quick question: would a "jsonc" alias suffice to the json.js returned object?
From what I gather the json language defined inside hljs already accepts comments

[joshgoebel]

Yes we just need to add the alias.