added basic CLS support with re-entrant transactions

src/services/cls.js

@@ -0,0 +1,16 @@
+const clsHooked = require('cls-hooked');
+const namespace = clsHooked.createNamespace("trilium");
+
+async function init(callback) {
+    return await namespace.runAndReturn(callback);
+}
+
+function wrap(callback) {
+    return async () => await init(callback);
+}
+
+module.exports = {
+    init,
+    wrap,
+    namespace
+};