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/android/app/build.gradle

@@ -41,7 +41,17 @@ android {
             applicationIdSuffix ".dev"
             versionNameSuffix "-dev"
             manifestPlaceholders = [
-                    appLabel: "Business dev",
+                    appLabel: "Krow Business dev",
+                    appIcon: "@mipmap/ic_launcher_dev"
+            ]
+        }
+
+        staging {
+            dimension "release-type"
+            applicationIdSuffix ".staging"
+            versionNameSuffix "-staging"
+            manifestPlaceholders = [
+                    appLabel: "Krow Business staging",
                     appIcon: "@mipmap/ic_launcher_dev"
             ]
         }