Bundle sql worker with webpack

ts/sql/mainWorkerBindings.ts

@@ -0,0 +1,13 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// This is a shim that gets inserted in place of `bindings` npm module when
+// building sql worker bundle.
+module.exports = (binding: string) => {
+  if (binding === 'better_sqlite3.node') {
+    // eslint-disable-next-line global-require, import/no-unresolved
+    return require('better_sqlite3.node');
+  }
+
+  throw new Error(`Unknown binding ${binding}`);
+};