Expectation of logical formula over a probabilistic circuits

[khosravipasha]

1. Given Logical Formula, and a psdd (pc, vtree)
2. Compile it to a smooth logical circuit with the same vtree
3. Compute Expectation of logical circuit w.r.t. the pc.

Other options could be

1. Given a logical Formula
2. Compile it to a smooth struct decomasable logical cirucit, and get the vtree.
3. Learn a PC abiding the vtree
4. Compute Expectation

[khosravipasha]

For general usecase waiting on: https://github.com/Juice-jl/LogicCircuits.jl/issues/43