Expose contents of Constraints #7603
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Which issue does this PR close?
Closes #7511
Rationale for this change
Make the whole LogicalPlan introspectable again.
What changes are included in this PR?
Are these changes tested?
Simple unit test included.
Are there any user-facing changes?
Publishes
Constraint.Implements
DerefforConstraintsto get&[Constraint]. This allows iteratingConstraints(Without having to implement a whole iterator, or usingimpl Iterator; code is easy to switch to either of those approaches is someone has a very strong opinion. KISS sounds right to me.).