feat(Typebot): add splitMessages and timePerChar fields to Typebot models

- Introduced `splitMessages` and `timePerChar` fields in the Typebot and TypebotSetting models with default values.
- Created a migration script to update the database schema accordingly.
- Updated audio message handling to prepend `[audio]` to transcriptions for better clarity in message context.

prisma/postgresql-migrations/20250612155048_add_coluns_trypebot_tables/migration.sql

@@ -0,0 +1,7 @@
+-- AlterTable
+ALTER TABLE "Typebot" ADD COLUMN     "splitMessages" BOOLEAN DEFAULT false,
+ADD COLUMN     "timePerChar" INTEGER DEFAULT 50;
+
+-- AlterTable
+ALTER TABLE "TypebotSetting" ADD COLUMN     "splitMessages" BOOLEAN DEFAULT false,
+ADD COLUMN     "timePerChar" INTEGER DEFAULT 50;