feat: Implement bucket ownership controls

Bucket ACLs are now disabled by default the same as AWS.
By default the object ownership is BucketOwnerEnforced
which means that bucket ACLs are disabled. If one attempts
to set bucket ACL the following error is returned both in
the gateway and on AWS:
	ErrAclNotSupported: {
		Code:           "AccessControlListNotSupported",
		Description:    "The bucket does not allow ACLs",
		HTTPStatusCode: http.StatusBadRequest,
	},

ACls can be enabled with PutBucketOwnershipControls

Changed bucket canned ACL translation

New backend interface methods:
PutBucketOwnershipControls
GetBucketOwnershipControls
DeleteBucketOwnershipControls

Added these to metrics

backend/s3proxy/s3.go

@@ -55,6 +55,8 @@ type S3Proxy struct {
 	debug           bool
 }
 
+var _ backend.Backend = &S3Proxy{}
+
 func New(access, secret, endpoint, region string, disableChecksum, sslSkipVerify, debug bool) (*S3Proxy, error) {
 	s := &S3Proxy{
 		access:          access,
@@ -128,6 +130,37 @@ func (s *S3Proxy) DeleteBucket(ctx context.Context, input *s3.DeleteBucketInput)
 	return handleError(err)
 }
 
+func (s *S3Proxy) PutBucketOwnershipControls(ctx context.Context, bucket string, ownership types.ObjectOwnership) error {
+	_, err := s.client.PutBucketOwnershipControls(ctx, &s3.PutBucketOwnershipControlsInput{
+		Bucket: &bucket,
+		OwnershipControls: &types.OwnershipControls{
+			Rules: []types.OwnershipControlsRule{
+				{
+					ObjectOwnership: ownership,
+				},
+			},
+		},
+	})
+	return handleError(err)
+}
+
+func (s *S3Proxy) GetBucketOwnershipControls(ctx context.Context, bucket string) (types.ObjectOwnership, error) {
+	var ownship types.ObjectOwnership
+	resp, err := s.client.GetBucketOwnershipControls(ctx, &s3.GetBucketOwnershipControlsInput{
+		Bucket: &bucket,
+	})
+	if err != nil {
+		return ownship, handleError(err)
+	}
+	return resp.OwnershipControls.Rules[0].ObjectOwnership, nil
+}
+func (s *S3Proxy) DeleteBucketOwnershipControls(ctx context.Context, bucket string) error {
+	_, err := s.client.DeleteBucketOwnershipControls(ctx, &s3.DeleteBucketOwnershipControlsInput{
+		Bucket: &bucket,
+	})
+	return handleError(err)
+}
+
 func (s *S3Proxy) CreateMultipartUpload(ctx context.Context, input *s3.CreateMultipartUploadInput) (*s3.CreateMultipartUploadOutput, error) {
 	out, err := s.client.CreateMultipartUpload(ctx, input)
 	return out, handleError(err)