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/autofill_wallet_usage_specifics.proto

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+// Copyright 2022 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;
+
+// Autofill usage data related objects which contains usage data of a payment
+// method related to a specific merchant.
+
+message AutofillWalletUsageSpecifics {
+  // A unique ID identifying this item. Used as the client tag.
+  optional string guid = 1;
+
+  // The type of usage data this entity is associated with.
+  oneof usage_data_type {
+    VirtualCardUsageData virtual_card_usage_data = 2;
+  }
+
+  message VirtualCardUsageData {
+    // The instrument id of the actual card that the virtual card is related to.
+    optional int64 instrument_id = 1;
+
+    // The last four of the virtual card number. This is tied to the usage
+    // data because the virtual card number may vary depending on merchants.
+    optional string virtual_card_last_four = 2;
+
+    // The url of the merchant where the virtual card is used.
+    optional string merchant_url = 3;
+
+    // The merchant the usage data is related to on the Android platform.
+    optional string merchant_app_package = 4;
+  }
+}