Change SeqScan node to contain Scan node

Peter Eisentraut <peter@eisentraut.org>

Commit: 2226b4189bb4ccfcc53917a8695d24e91ff2f950
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-08-08T16:46:34Z
Releases: 15.0
Change SeqScan node to contain Scan node

This makes the structure of all Scan-derived nodes the same,
independent of whether they have additional fields.

Discussion: https://www.postgresql.org/message-id/flat/c1097590-a6a4-486a-64b1-e1f9cc0533ce@enterprisedb.com

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