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/security_event_specifics.proto

@@ -0,0 +1,29 @@
+// Copyright 2019 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Sync protocol datatype extension for security events.
+
+// 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;
+
+import "gaia_password_reuse.proto";
+
+message SecurityEventSpecifics {
+  // The specific security event to record.
+  oneof event { GaiaPasswordReuse gaia_password_reuse_event = 1; }
+
+  // Time of event, as measured by client in microseconds since Windows epoch.
+  optional int64 event_time_usec = 2;
+}