Change build setup of JS clients, reintroduce beta publishing after losing it due to unmerged code (#238)

cmd/clients/ts/tsconfig.es.json

@@ -0,0 +1,16 @@
+{
+    "compilerOptions": {
+      "module": "ES2015",
+      "target": "ES6",
+      "declaration": true,
+      "lib": ["es2015", "dom"],
+      "experimentalDecorators": true,
+      "emitDecoratorMetadata": true,
+      "outDir": "./tmp/esm",
+      "strict": true,
+      "moduleResolution": "node",
+      "esModuleInterop": true
+    },
+    "include": ["src/index.ts", "src/**/*"],
+    "exclude": ["./dist", "./node_modules"]
+  }