[#126] sdk: implement container rpc for in client

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/container/container.go

@@ -0,0 +1,45 @@
+package container
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/container"
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+)
+
+type Container struct {
+	container.Container
+}
+
+func New(opts ...NewOption) (*Container, error) {
+	cnrOptions := defaultContainerOptions()
+	for i := range opts {
+		opts[i].apply(&cnrOptions)
+	}
+
+	cnr := new(Container)
+	cnr.SetNonce(cnrOptions.nonce[:])
+	cnr.SetBasicACL(cnrOptions.acl)
+
+	if cnrOptions.policy != "" {
+		// todo: set placement policy
+	}
+
+	if cnrOptions.owner != nil {
+		owner := new(refs.OwnerID)
+		owner.SetValue(cnrOptions.owner[:])
+
+		cnr.SetOwnerID(owner)
+	}
+
+	attributes := make([]*container.Attribute, len(cnrOptions.attributes))
+	for i := range cnrOptions.attributes {
+		attribute := new(container.Attribute)
+		attribute.SetKey(cnrOptions.attributes[i].key)
+		attribute.SetValue(cnrOptions.attributes[i].value)
+		attributes[i] = attribute
+	}
+	if len(attributes) > 0 {
+		cnr.SetAttributes(attributes)
+	}
+
+	return cnr, nil
+}