Port Brave Sync server to Rust

Use SQLite for persistence and generate Rust protobuf bindings at build time.

Add Docker image support for containerized deployment.

Co-Authored-By: codex <[email protected]>

schema/protobuf/sync_pb/sync_invalidations_payload.proto

@@ -0,0 +1,39 @@
+// Copyright 2020 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// If you change or add any fields in this file, update proto_visitors.h and
+// potentially proto_enum_conversions.{h, cc}.
+
+syntax = "proto2";
+
+option go_package = "./sync_pb";
+
+option java_multiple_files = true;
+option java_package = "org.chromium.components.sync.protocol";
+
+option optimize_for = LITE_RUNTIME;
+
+package sync_pb;
+
+// The payload coming from the server for all invalidated data types.
+message SyncInvalidationsPayload {
+  message DataTypeInvalidation {
+    // The legitimate values of this field correspond to the protobuf field
+    // numbers of all EntitySpecifics fields supported by the server (see
+    // components/sync/protocol/sync.proto).
+    optional int32 data_type_id = 1;
+  }
+
+  // This field contains information about each data type which needs to be
+  // updated. Note that it may contain data types which current client is not
+  // interested in.
+  repeated DataTypeInvalidation data_type_invalidations = 1;
+
+  // Opaque field, which has to be provided as part of resulting GetUpdates
+  // back to the server.
+  optional bytes hint = 2;
+
+  // Version of invalidation, used to order incoming invalidations.
+  optional int64 version = 3;
+}