Add support for let .. in constructions in Z3 backend #434
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This PR extends the Z3 backend with support for let ... in constructs in Catala source programs.
let x = e1 in e2expressions are translated toEApp (fun x -> e2) e1. This PR recognizes this specific pattern,and performs beta-reduction before translating the expression post-substitution.
It also adds a small example inspired from the one in #389.
Fixes #389