Support for schemas outside of public schema

[lyqht]

Based on this tweet, the current implementation of open-api typescript to get types from the REST endpoint does not return definitions outside of the public schema.

According to the supabase folks, they have a CLI command supabase gen types typescript which will help to generate types outside of the public schema.

Hence, whoever picks up this issue can try to look into the Supabase CLI repo to see how they did this and then update this action.