Summary:
Using SPLIT option to create a partitioned table doesn't make sense.
With change in this diff, we ignore the split option in the CREATE TABLE statement of a partitioned table.
Jira: DB-16196

Test Plan: ./yb_build.sh --java-test 'org.yb.pgsql.TestPgRegressMisc#testPgRegressMiscSerial2'

Reviewers: mihnea, telgersma

Reviewed By: telgersma

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D43210