Implement operators for checking if the range contains a multirange

Alexander Korotkov <akorotkov@postgresql.org>

Commit: 4d7684cc754f312aee468abb83ca4f7da94b30a3
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2020-12-29T20:35:33Z
Releases: 14.0
Implement operators for checking if the range contains a multirange

We have operators for checking if the multirange contains a range but don't
have the opposite.  This commit improves completeness of the operator set by
adding two new operators: @> (anyrange,anymultirange) and
<@(anymultirange,anyrange).

Catversion is bumped.

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