* Adds a loader to enable jinja imports.
* Switch to in-memory
* Move loading custom_jinja off of the event loop
* Raise TemplateNotFound if template doesn't exist
* Fix docstring
* Adds a service to reload custom jinja
* Remove IO from test setup
* Improve coverage and small refactor
* Incorporate feedback and use .jinja extension
* Check the loaded sources in test.
* Incorporate PR feedback.
* Update homeassistant/helpers/template.py
Co-authored-by: Erik Montnemery <erik@montnemery.com>
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Co-authored-by: Erik Montnemery <erik@montnemery.com>
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