* Add service response data for listing calendar events
Add the capability of response data for for the entity component.
* Rename input arguments and add service description
* Improve list events to be more user friendly
Allow the end date to be determined based on a relative time duration. Make the start time optional and set to "now". Add additional test coverage. Update demo calendar to actually perform date range checks.
* Wrap docstrings properly.
* Increase test coverage
* Update to use new API calls
* Readability improvements
* Wrap docstrings
* Require at least one of end or duration
* Check for multiple entity matches earlier in the request
* Update documentation strings
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