[supabase] missing spec

[Estee Tey]

Sanity checks

• My issue relates to a specific CLI completion spec (e.g. git checkout is missing options in git completion spec). If your issue is more general, please create your issue here: withfig/fig
• I have searched github.com/withfig/autocomplete/issues and there are no duplicates of my issue
• I would like to work on this.

What CLI tool does this relate to?

supabase

Which statement makes the most sense?

This completion spec does not exist

Issue Details

I see that previously this feature was being worked on in this PR (#713), but it looks like the branch has been abandoned since then. Supabase also has gone through quite a few changes in their CLI tool, so it will be nice if we can have a more updated autocomplete spec for it.