Complete Firebase setup with Data Connect and security rules

- Initialize Firebase Data Connect
- Deploy Firestore security rules for SMTP config
- Update firebase.json with Firestore configuration
- Add generated Data Connect SDKs

dataconnect/example/connector.yaml

@@ -0,0 +1,8 @@
+connectorId: example
+generate:
+  javascriptSdk:
+    - outputDir: ..\..\src\dataconnect-generated
+      package: "@dataconnect/generated"
+      packageJsonDir: ..\..
+      react: true
+      angular: false