Support arbitrary expressions with arithmetics in projections

requires #309 (closed)

Currently we does not support expression as projection that is needed for #174 (closed) and #176 (closed).

We need to support arbitrary expression consisting of logical, comparison and arithmetic operations and as sub-expression of aggregates.

Definition of done:

• arbitrary expressions added to grammar as projection
• arbitrary expressions added to ir
• arithmetic expression added to explain
• unit test (negative + positive)
• integration test (negative + positive)