Function AddErrorCodesEnumPluginFactory

Adds a detached enum type to the GraphQL schema, listing all possible ErrorCode values and adding messages as a descriptions.

Make sure to add it after EnforceStrictPermissionsPlugin or any other plugin that might filter queries out of the resulting schema.

If there is a need to adjust this enum - use GraphQLEnumType postgraphile hook and isErrorCodesEnum scope to find the generated enum. E.g.

 builder.hook('GraphQLEnumType', (enumField, _build, context) => {
   if (context.scope.isErrorCodesEnum === true) {
     // Modification logic
   }
   return enumField;
 });
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