[remote-storage][v2] Add IDL for dependency storage (#6738)

## Which problem is this PR solving?
- Towards #6629

## Description of the changes
- This PR adds the IDL for the dependency reader for the v2 remote
storage API

## How was this change tested?
- CI

## Checklist
- [x] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [x] I have signed all commits
- [x] I have added unit tests for the new functionality
- [x] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `npm run lint` and `npm run test`

---------

Signed-off-by: Mahad Zaryab <[email protected]>

internal/storage/v2/grpc/dependency_storage.proto

@@ -0,0 +1,45 @@
+syntax = "proto3";
+
+package jaeger.storage.v2;
+
+import "gogoproto/gogo.proto";
+import "google/protobuf/timestamp.proto";
+
+option go_package = "storage";
+
+message GetDependenciesRequest {
+  // start_time is the start of the time interval to search for the dependencies.
+  google.protobuf.Timestamp start_time = 1 [
+    (gogoproto.stdtime) = true,
+    (gogoproto.nullable) = false
+  ];
+  // end_time is the end of the time interval to search for the dependencies.
+  google.protobuf.Timestamp end_time = 2 [
+    (gogoproto.stdtime) = true,
+    (gogoproto.nullable) = false
+  ];
+}
+
+// Dependency represents a relationship between two services.
+message Dependency {
+  // parent is the name of the caller service.
+  string parent = 1;
+
+  // child is the name of the service being called.
+  string child = 2;
+
+  // call_count is the number of times the parent service called the child service.
+  uint64 call_count = 3;
+
+  // source contains the origin from where the dependency was extracted.
+  string source = 4;
+}
+
+message GetDependenciesResponse {
+  repeated Dependency dependencies = 1 [(gogoproto.nullable) = false];
+}
+
+service DependencyReader {
+  // GetDependencies loads service dependencies from storage.
+  rpc GetDependencies(GetDependenciesRequest) returns (GetDependenciesResponse);
+}

scripts/makefiles/Protobuf.mk

@@ -112,6 +112,7 @@ proto-storage-v1:
 .PHONY: proto-storage-v2
 proto-storage-v2:
 	$(call proto_compile, proto-gen/storage/v2, internal/storage/v2/grpc/trace_storage.proto, -Iinternal/storage/v2/grpc/)
+	$(call proto_compile, proto-gen/storage/v2, internal/storage/v2/grpc/dependency_storage.proto, -Iinternal/storage/v2/grpc/)
 
 .PHONY: proto-hotrod
 proto-hotrod: