Give enum tables a different icon on the sidebar

[Xetera]

It gets a little difficult to keep track of enum tables once you're past a certain amount. I feel like something like this could help

I would be happy to give this a shot if it's something the hasura team is interested in and if this data is available to the frontend

Possibly related #4981

[rikinsk]

@Xetera Would be awesome if you could raise a PR for this. The information should be available. cc: @beerose

The only question remaining is what should the icon be? Maybe this?

[beerose]

Yes, all the information is available. Here is the corresponding part of the code.
You can check if a table is an enum table by accessing is_enum property from table object.