[#9999] services: Generate BillingService proto

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/billing/service.proto

@@ -0,0 +1,87 @@
+syntax = "proto3";
+
+package billing;
+
+option go_package = "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/billing";
+
+// `BillingService` provides an interface to get usage statistics.
+service BillingService {
+  // Returns list that contains container usage statistic.
+  rpc ListContainers(ListContainersRequest) returns (ListContainersResponse);
+}
+
+// Signature of some message.
+message Signature {
+  // Public key used for signing.
+  bytes key = 1;
+
+  // Binary signature.
+  bytes signature = 2;
+}
+
+message ListContainersRequest {
+  message Body {
+    // Container IDs to get container metrics. Not required. Maximum count is
+    // 10000 items.
+    repeated bytes container_id = 1;
+    // Max items count in the response. Not required. Default value is 1000. Not
+    // applicable if container_id is specified. Maximum value is 10000.
+    uint32 limit = 2;
+    // Next page token used to continue listing. Not required. If null or empty,
+    // listing starts from the beginning.
+    bytes next_page_token = 3;
+  }
+
+  Body body = 1;
+  Signature signature = 2;
+}
+
+message ListContainersResponse {
+  message Body {
+    message ContainerInfo {
+      message Count {
+        uint64 phy = 1;
+        uint64 logic = 2;
+        uint64 user = 3;
+      }
+      message Size { uint64 logic = 1; }
+      message Attributes {
+        // Container owner's wallet bytes.
+        bytes owner_wallet = 1;
+        // Container zone.
+        string zone = 2;
+      }
+      enum Status {
+        // Undefined status, default value.
+        UNDEFINED = 0;
+        // Container is available.
+        AVAILABLE = 1;
+        // Container is deleted.
+        DELETED = 2;
+      }
+
+      // Container ID.
+      bytes container_id = 1;
+      // Container status.
+      Status container_status = 2;
+      // Container attributes. May be null if container attributes are
+      // unavailable for current moment or container already deleted.
+      Attributes attributes = 3;
+      // Count of the objects in container.
+      Count count = 4;
+      // Size of the objects in container.
+      Size size = 5;
+    }
+
+    repeated ContainerInfo result = 1;
+    // Next page token used to get next batch. If returned value is null or
+    // empty, then listing completed.
+    bytes next_page_token = 2;
+    // Returned result is partial. This could happend if some shards are in
+    // degraded mode or returned an error.
+    bool partial = 3;
+  }
+
+  Body body = 1;
+  Signature signature = 2;
+}