sql: support CREATE TABLE AS ... WITH NO DATA

[virajchogle]

Fixes #171333

Adds support for CREATE TABLE AS ... WITH NO DATA, matching PostgreSQL.

Coverage in pkg/sql/logictest/testdata/logic_test/create_as includes regular tables, explicit WITH DATA, default behavior, IF NOT EXISTS, and TEMP TABLE.

Epic: none

Release note (sql change): CREATE TABLE AS ... WITH NO DATA is now supported. It creates the destination table with the source query's schema and no rows, matching PostgreSQL

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[cockroach-teamcity]

This change is 

[rafiss]

thanks for your contribution. you need to run ./dev gen docs and then this can get merged

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