Get fundamentals up for allowing batched event handlers

Source/Runtime/Events.Processing/EventHandlers.proto

@@ -48,14 +48,25 @@ message HandleEventRequest {
     RetryProcessingState retryProcessingState = 3;
 }
 
+message HandleEventBatchRequest {
+    services.ReverseCallRequestContext callContext = 1;
+    repeated StreamEvent events = 2;
+    RetryProcessingState retryProcessingState = 3;
+}
+
 message EventHandlerRuntimeToClientMessage {
     oneof Message {
         EventHandlerRegistrationResponse registrationResponse = 1;
-        HandleEventRequest handleRequest = 2;
+        HandleEventRequest handleRequest = 2 [deprecated = true]; // Replaced by handleBatchRequest
         services.Ping ping = 3;
+        HandleEventBatchRequest handleBatchRequest = 4;
     }
 }
 
 service EventHandlers {
-    rpc Connect(stream EventHandlerClientToRuntimeMessage) returns(stream EventHandlerRuntimeToClientMessage);
+    rpc Connect(stream EventHandlerClientToRuntimeMessage) returns(stream EventHandlerRuntimeToClientMessage){
+        option deprecated = true;
+    }; // Replaced by ConnectBatched
+    rpc ConnectBatched(stream EventHandlerClientToRuntimeMessage) returns(stream EventHandlerRuntimeToClientMessage);
+
 }

Source/Runtime/Events.Processing/Processors.proto

@@ -19,6 +19,7 @@ message ProcessorFailure {
     string reason = 1;
     bool retry = 2;
     google.protobuf.Duration retryTimeout = 3;
+    StreamEventMetadata eventMetadata = 4; // The metadata of the event that failed
 }
 
 message RetryProcessingState {

Source/Runtime/Events.Processing/StreamEvent.proto

@@ -13,7 +13,15 @@ option go_package = "go.dolittle.io/contracts/runtime/events/processing";
 
 message StreamEvent {
     events.CommittedEvent event = 1;
-    string partitionId = 2;
-    protobuf.Uuid scopeId = 3;
-    bool partitioned = 4;
+    string partitionId = 2 [deprecated = true]; // Replaced by metadata
+    protobuf.Uuid scopeId = 3 [deprecated = true]; // Replaced by metadata
+    bool partitioned = 4 [deprecated = true]; // Replaced by metadata
+    StreamEventMetadata metadata = 5; // The metadata of the stream event
 }
+
+message StreamEventMetadata {
+    string partitionId = 1; // The partition id of the event
+    protobuf.Uuid scopeId = 2; // The scope id of the event
+    bool partitioned = 3; // Whether the stream is partitioned or not
+    uint64 streamPosition = 4; // The stream position of the event
+}