YAML Sensor

**Describe the problem you have/What new integration you would like**

A feature that allows for the creation of a text sensor with the YAML file included

**Please describe your use case for this integration and alternatives you've tried:**

This would allow a device sold to someone or shared to a friend to be integrated into ESPHOME with YAML and an update path provided with limited user frustration. It would also provide a device recovery option if backups were not valid.

**Additional context**

The request does not name a source file, test, or entry point. Start by determining how ESPHome text sensors and YAML configurations are currently represented, then clarify the expected embedded YAML and update or recovery behavior. Done would require an agreed design and implementation scope.

Written by the indexing model from the issue text.