Add rewriter to transform equals for id(a), a.prop to in collection predicates
Add a rewriter for splitting IN in constants value and not constant values
Add rewriter for merging IN collection predicates when relates to the same lhs and contain only constant values
Use the introduced rewriter in Ronja

o remove code which was needed for handling equals
o cleanup on normalizeEqualsArgumentOrder
Merge pull request #2550 from davidegrohmann/rewriter-or-equals-in-collection

Ast rewriter for transforming ORs of Equals to IN collection