YAML Sensor

[titchy]

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