Update Resolve function to support Is interface

The Is interface may be used to resolve if no other unwrap interface is
implemented. This interface is safe to use in this situation, unlike
errors.Is, since the error should not be unwrapped further.

Signed-off-by: Derek McGowan <derek@mcg.dev>

resolve.go

@@ -111,6 +111,30 @@ func firstError(err error) error {
 				}
 			}
 			return nil
+		case interface{ Is(error) bool }:
+			for _, target := range []error{ErrUnknown,
+				ErrInvalidArgument,
+				ErrNotFound,
+				ErrAlreadyExists,
+				ErrPermissionDenied,
+				ErrResourceExhausted,
+				ErrFailedPrecondition,
+				ErrConflict,
+				ErrNotModified,
+				ErrAborted,
+				ErrOutOfRange,
+				ErrNotImplemented,
+				ErrInternal,
+				ErrUnavailable,
+				ErrDataLoss,
+				ErrUnauthenticated,
+				context.DeadlineExceeded,
+				context.Canceled} {
+				if e.Is(target) {
+					return target
+				}
+			}
+			return nil
 		default:
 			return nil
 		}