[#315] api: Restore test.proto file

Introduced in #281.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

api/util/proto/test/test.proto

@@ -0,0 +1,46 @@
+syntax = "proto3";
+
+package test;
+
+option go_package = "util/proto/test";
+
+message Primitives {
+  bytes field_a = 1;
+  string field_b = 2;
+  bool field_c = 200;
+  int32 field_d = 201;
+  uint32 field_e = 202;
+  int64 field_f = 203;
+  uint64 field_g = 204;
+  fixed64 field_i = 205;
+  double field_j = 206;
+  fixed32 field_k = 207;
+
+  enum SomeEnum {
+    UNKNOWN = 0;
+    POSITIVE = 1;
+    NEGATIVE = -1;
+  }
+  SomeEnum field_h = 300;
+
+  message Aux { uint32 inner_field = 1; }
+
+  oneof field_m {
+    bytes field_ma = 401;
+    uint32 field_me = 402;
+    Aux field_aux = 403;
+  }
+}
+
+message RepPrimitives {
+  repeated bytes field_a = 1;
+  repeated string field_b = 2;
+  repeated int32 field_c = 3;
+  repeated uint32 field_d = 4;
+  repeated int64 field_e = 5;
+  repeated uint64 field_f = 6;
+  repeated uint64 field_fu = 7 [ packed = false ];
+
+  message Aux { uint32 inner_field = 1; }
+  repeated Aux field_aux = 8;
+}