Change String() to accept a value reciever. (#1239)

Since Plugin returns a TypedName by value the String method with pointer receiver was not called.
Go happily calls the value reciver based methods for pointers as well.

Signed-off-by: Etai Lev Ran <elevran@gmail.com>

Author: elevran

pkg/epp/plugins/typedname.go

@@ -29,6 +29,6 @@ type TypedName struct {
 }
 
 // String returns the type and name rendered as "<name>/<type>".
-func (tn *TypedName) String() string {
+func (tn TypedName) String() string {
 	return tn.Name + separator + tn.Type
 }