api: Change streams > stream to be consistent.

api/proto/stream/api_request.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package stream;
+
+option go_package = "github.com/chirpstack/chirpstack/api/go/v4/stream";
+option java_package = "io.chirpstack.api.stream";
+option java_multiple_files = true;
+option java_outer_classname = "ApiRequestProto";
+option csharp_namespace = "Chirpstack.Stream";
+
+import "google/protobuf/timestamp.proto";
+import "common/common.proto";
+import "gw/gw.proto";
+
+message ApiRequestLog {
+  // API service name.
+  string service = 1;
+
+  // API method name.
+  string method = 2;
+
+  // Metadata.
+  map<string, string> metadata = 3;
+}