feat: adding _emulator folder

* feat: added `_emulator` folder

* chore: new lines

Author: pr-Mais

_emulator/.firebaserc

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+{
+  "projects": {
+    "default": "demo-project"
+  }
+}

_emulator/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+firebase-debug.*.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

_emulator/extensions/export-user-data.env

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+ALLOWED_EVENT_TYPES=firebase.extensions.export-user-data.v1.firestore
+CLOUD_STORAGE_EXPORT_BUCKET=extensions-testing.appspot.com
+CLOUD_STORAGE_EXPORT_DIRECTORY=user-data
+ENABLE_ZIP=yes
+EVENTARC_CHANNEL=projects/${param:PROJECT_ID}/locations/us-central1/channels/firebase
+FIRESTORE_EXPORTS_COLLECTION=exports
+LOCATION=us-central1
+SELECTED_DATABASE_LOCATION=us-central1

_emulator/extensions/firestore-record-acknowledgments.env

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+ACKNOWLEDGMENTS_COLLECTION=acknowledgments
+LOCATION=us-central1
+NOTICES_COLLECTION=notices

_emulator/extensions/image-processing-api.env

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+CLOUD_STORAGE_BUCKET=extensions-testing.appspot.com
+CORS_ORIGIN_ALLOW_LIST=*
+LOCATION=us-central1

_emulator/firebase.json

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+{
+  "emulators": {
+    "functions": {
+      "port": 5001
+    },
+    "firestore": {
+      "port": 8080
+    },
+    "pubsub": {
+      "port": 8085
+    },
+    "storage": {
+      "port": 9199
+    },
+    "eventarc": {
+      "port": 9299
+    },
+    "ui": {
+      "enabled": true
+    },
+    "singleProjectMode": true
+  },
+  "extensions": {
+    "export-user-data": "../extensions/export-user-data",
+    "firestore-record-acknowledgments": "../extensions/firestore-record-acknowledgments",
+    "image-processing-api": "../extensions/image-processing-api"
+  }
+}