add an artifact ID to the artifact intent/upload requests (#40)

src/bitdrift_public/protobuf/client/v1/api.proto

@@ -256,6 +256,10 @@ message UploadArtifactIntentRequest {
   // The metadata associated with the artifact. This is a binary blob that is interpreted by the server
   // based on the type_id.
   bytes metadata = 3;
+
+  // A client-generated ID that uniquely identifies the artifact. This is used to correlate the artifact
+  // with logs that reference it.
+  string artifact_id = 4 [(validate.rules).string = {min_len: 1}];
 }
 
 message UploadArtifactIntentResponse {
@@ -285,7 +289,11 @@ message UploadArtifactRequest {
   string type_id = 2 [(validate.rules).string = {min_len: 1}];
 
   // The artifact to upload. This is a binary blob that is interpreted by the server based on the type_id.
-  bytes contents = 3 [(validate.rules).bytes = {min_len: 1}];
+  bytes contents = 3;
+
+  // A client-generated ID that uniquely identifies the artifact being uploaded. This is used to correlate
+  // the artifact with logs that reference it.
+  string artifact_id = 4 [(validate.rules).string = {min_len: 1}];
 }
 
 message UploadArtifactResponse {