* feat(content api): add error endpoint
Add an endpoint to return the details of a Supabase error, given the
error code and service.
Schema additions:
```graphql
type RootQueryType {
"...previous root queries"
"""Get the details of an error code returned from a Supabase service"""
error(code: String!, service: Service!): Error
}
"""An error returned by a Supabase service"""
type Error {
"""
The unique code identifying the error. The code is stable, and can be used for string matching during error handling.
"""
code: String!
"""The Supabase service that returns this error."""
service: Service!
"""The HTTP status code returned with this error."""
httpStatusCode: Int
"""
A human-readable message describing the error. The message is not stable, and should not be used for string matching during error handling. Use the code instead.
"""
message: String
}
enum Service {
AUTH
REALTIME
STORAGE
}
```
* test(content api): add tests for top-level query `error`