add: config client-error-verbosity to set error verbosity

Set error verbosity using this config. The verbosity can
be set to `verbose` or `minimal` for client error responses.

This only affects client side HTTP responses, server side logs
are not affected by this config.

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

src/PostgREST/Error/Types.hs

@@ -25,7 +25,6 @@ import PostgREST.SchemaCache.Identifiers  (QualifiedIdentifier (..))
 import PostgREST.SchemaCache.Relationship (Relationship (..),
                                            RelationshipsMap)
 import PostgREST.SchemaCache.Routine      (Routine (..))
-
 import Protolude
 
 data Error