Implement "bytes" primitive type

examples/tosca/future/tosca_2_0.yaml

@@ -4,3 +4,20 @@ metadata:
 
   template_name: TOSCA 2.0 Example
   template_author: Puccini
+
+node_types:
+
+  DataNode:
+    properties:
+      bytes:
+        # Base64-encoded data
+        type: bytes
+
+topology_template:
+
+  node_templates:
+
+    data:
+      type: DataNode
+      properties:
+        bytes: UHVjY2luaQ==

tosca/grammars/tosca_v2_0/bytes.go

@@ -1,11 +1,24 @@
 package tosca_v2_0
 
 import (
+	"github.com/tliron/kutil/util"
 	"github.com/tliron/puccini/tosca"
 )
 
+//
+// Bytes
+//
+
 // tosca.Reader signature
 func ReadBytes(context *tosca.Context) tosca.EntityPtr {
-	// TODO
-	return nil
+	var bytes []byte
+
+	if b64 := context.ReadString(); b64 != nil {
+		var err error
+		if bytes, err = util.FromBase64(*b64); err != nil {
+			context.ReportValueMalformed("bytes", "invalid base64")
+		}
+	}
+
+	return bytes
 }