Add promptTokens and completionTokens to model output (#11)

* Default to streaming in config

* Add tokens to database

* Add NEXT_PUBLIC_SOCKET_URL to .env.example

* Disable streaming for functions

* Add newline to types

prisma/migrations/20230706193243_add_tokens_to_model_output/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "ModelOutput" ADD COLUMN     "completionTokens" INTEGER,
+ADD COLUMN     "promptTokens" INTEGER;