Add support for query_template to SQL integration

[VDRainer]

Had that idea a while ago.

Recommendation for custom SQL query setup

Good point! I think this would be a great enhancement for @dgomes’s SQL Sensor. ‘Allow templates in sql querys’ Something like: query: "select name from caller_id_table where number = {{ state_attr('sensor.modem_callerid', 'cid_number') }}"