Ensure that CREATE TABLE LIKE copies any NO INHERIT constraint property.

Since the documentation about LIKE doesn't say that a copied constraint
has properties different from the original, it seems that ignoring
a NO INHERIT property doesn't meet the principle of least surprise.
So make it copy that.

(Note, however, that we still don't copy a NOT VALID property;
CREATE TABLE offers no way to do that, plus it seems pointless.)

Arguably this is a bug fix; but no back-patch, as it seems barely
possible somebody is depending on the current behavior.

Ildar Musin and Chris Travers; reviewed by Amit Langote and myself

Discussion: https://postgr.es/m/CAONYFtMC6C+3AWCVp7Yd8H87Zn0GxG1_iQG6_bQKbaqYZY0=-g@mail.gmail.com

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