Add JavaScript as first-class citizen for local unit tests

[wiverson]

Feature request

https://github.com/JerrySievert/equinox offers a nice option for using JavaScript to test databases.

Describe the solution you'd like

Currently, https://supabase.com/docs/reference/cli/supabase-test tests using PgTAP. It would be very nice to have supabase test execute JavaScript based tests in addition to PgTAP out-of-the-box.

Describe alternatives you've considered

PgTAP is not particularly friendly for a new user to learn. As many (most?) users of Supabase come primarily from a JavaScript background, it would great to offer a more user-friendly option for testing.