Support short names - expose internal API

[jmparsons]

I've noticed that in emojis.json, there are fields for both the short name and its variations. Would it be possible to expose this data through convenience methods?

It would be highly beneficial to have a unified value that allows access to the related emoji data along with any potential variations. If exporting the JSON or TypeScript version of emojis.json is feasible, that would also meet the need.

Much of the underlying logic for this functionality appears to have already been implemented, though it hasn't been fully exposed yet. Additionally, is there a straightforward method to convert emojis to a Slack-style shortcode, such as :+1::skin-tone-3:?