Allow integration template: in packages

[clemalex]

A good summary here

Migrating legacy templates to the new template section

There is no reason to transition… Literally keep what you already have. Ask yourself the following question: Do I want to have a binary sensor based on a trigger or event? If yes, then use the new template integration. It’s not a “new” format. It’s the format for the trigger templates. What everyone is referring to as “old” is not old. It’s the other type of template sensors and they are NOT going away. They did not move. They are trigger templates not to be confused with binary_sensor…

The new integration is for me like integration python_script that is not splitting

On the other hand, I would like both to be supported in the packages method.