Mechanism to provide to the pipeline run dynamically resolved values

[SilinPavel]

Background
Currently Cloud-Pipeline allows to specify some values that would be resolved dynamically such as ${RUN_ID}.
But this parameters works as place holders and and don't allow to perform some computation on a server side to calculate the value.

Let's introduce approach to calculate values for specific templates. e.g.:
$[UUID] - generate new UUID during execution