feat: Add Firebase configuration for staging and development environments

- Created google-services.json for staging environment.
- Updated firebase.json to include build configurations for dev and staging.
- Added flutterfire-config.sh script to generate Firebase configuration files.
- Modified Xcode project to include GoogleService-Info.plist for staging.
- Created staging.xcscheme for Xcode build configuration.
- Added GoogleService-Info.plist for dev and staging flavors.
- Generated firebase_options_dev.dart and firebase_options_staging.dart for Firebase initialization.

mobile-apps/client-app/flutterfire-config.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Script to generate Firebase configuration files for different environments/flavors
+
+if [[ $# -eq 0 ]]; then
+  echo "Error: No environment specified. Use 'dev', 'staging', or 'prod'."
+  exit 1
+fi
+
+case $1 in
+  dev)
+    flutterfire config \
+      --project=krow-workforce-dev \
+      --out=lib/firebase_options_dev.dart \
+      --ios-bundle-id=com.krow.app.business.dev \
+      --ios-out=ios/flavors/dev/GoogleService-Info.plist \
+      --android-package-name=com.krow.app.business.dev \
+      --android-out=android/app/src/dev/google-services.json
+    ;;
+  staging)
+    flutterfire config \
+      --project=krow-workforce-staging \
+      --out=lib/firebase_options_staging.dart \
+      --ios-bundle-id=com.krow.app.business.staging \
+      --ios-out=ios/flavors/staging/GoogleService-Info.plist \
+      --android-package-name=com.krow.app.business.staging \
+      --android-out=android/app/src/staging/google-services.json
+    ;;
+    prod)
+    flutterfire config \
+      --project=krow-workforce-dev \
+      --out=lib/firebase_options_dev.dart \
+      --ios-bundle-id=com.krow.app.business.dev \
+      --ios-out=ios/flavors/dev/GoogleService-Info.plist \
+      --android-package-name=com.krow.app.business.dev \
+      --android-out=android/app/src/dev/google-services.json
+    ;;
+  *)
+    echo "Error: Invalid environment specified. Use 'dev', 'staging', or 'prod'."
+    exit 1
+    ;;
+esac