* Elasticsearch: Add generic support for template variables
* format MovingAverage settings as numbers
* Move formatting logic to query builder & forma serial_diff settings as numbers
* modify presence check
* add todo
* minor fixes
* transform string values to numbers
* Move casting logic
* Slightly cleaner implementation
* Add BE tests
* Leverage elastic validation when string doesn't resolve to a numeric value
* move newly introduced test to testify
* add FE query_builder tests
* check error
* Parse values to float instead of int
* Fix tests & ParseFloat bit size