`auth.third_party.clerk` unable to add multiple domains

[jameslshannon]

Describe the bug
Supabase.com allows multiple domains to be added for a third party auth provider such as Clerk. The use case is where multiple apps share the same Supabase db but have differing auth configurations in Clerk (and therefore different Clerk domains).

To Reproduce
Steps to reproduce the behavior:

1. Add a domain in config.toml under [auth.third_party.clerk]
2. Add another domain in config.toml under [auth.third_party.clerk]
3. Run npx supabase stop
4. See error config: toml: key domain is already defined

Expected behavior
Multiple domains should be supported under [auth.third_party.clerk] - either as multiple domain entries or to allow domain to specify an array of domains in order to replicate the online Supabase configuration, thereby allowing multiple local apps to run that require different Clerk domains.