Use Zeebe's clock for evaluating decisions

[saig0]

Description

Currently, the DMN engine doesn't provide a way to set a clock. The FEEL engine uses a clock to retrieve the current time (i.e. for evaluating now() or today()). If no clock is set then the FEEL engine uses the system time.

In general, this is fine for most use cases. Except for testing, when the tests case manipulates the time. As a result, the DMN engine would not use the time that is set for Zeebe.

When the DMN engine supports setting a clock then we should use it in the DMN module to enable these test cases. This should look similar to the expression language module.

blocked by #8082

requires camunda/dmn-scala#105