Add testing environment configuration and create model factories for Operator and Park

.env.testing

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+APP_NAME="ThrillWiki"
+APP_ENV=testing
+APP_KEY=base64:UzB6YEBskhM4O43pu4z4F8pscMD3A6NPWPpwZ+lkaMU=
+APP_DEBUG=true
+APP_URL=http://localhost
+
+LOG_CHANNEL=stack
+LOG_DEPRECATIONS_CHANNEL=null
+LOG_LEVEL=debug
+
+DB_CONNECTION=pgsql
+DB_HOST=127.0.0.1
+DB_PORT=5432
+DB_DATABASE=thrillwiki_test
+DB_USERNAME=talor
+DB_PASSWORD=
+
+BROADCAST_DRIVER=log
+CACHE_DRIVER=array
+FILESYSTEM_DISK=local
+QUEUE_CONNECTION=sync
+SESSION_DRIVER=array