feat: add support for materialized segment targeting criteria (#201)

Author: nicklasl

confidence-resolver/protos/confidence/flags/types/v1/target.proto

@@ -3,6 +3,7 @@ package confidence.flags.types.v1;
 
 import "google/protobuf/timestamp.proto";
 
+option go_package = "github.com/spotify/confidence-resolver/openfeature-provider/go/confidence/internal/proto/types";
 option java_multiple_files = true;
 option java_package = "com.spotify.confidence.flags.types.v1";
 option java_outer_classname = "TargetingProto";
@@ -16,6 +17,7 @@ message Targeting {
     oneof criterion {
       AttributeCriterion attribute = 1;
       SegmentCriterion segment = 2 ;
+      MaterializedSegmentCriterion materialized_segment = 3;
     }
     message AttributeCriterion {
       string attribute_name = 1;
@@ -32,6 +34,10 @@ message Targeting {
     message SegmentCriterion {
       string segment = 1;
     }
+
+    message MaterializedSegmentCriterion {
+      string materialized_segment = 1;
+    }
   }
 
   // is match if at least one input item matches the inner rule