feat: support authorization syntax for CREATE SCHEMA and omitted schema name

[yezizp2012]

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What's changed and what's your intention?

Close #15680 .
Support syntax as follows:

CREATE SCHEMA [ IF NOT EXISTS ] schema_name [ AUTHORIZATION user_name ]
CREATE SCHEMA [ IF NOT EXISTS ] AUTHORIZATION user_name

Examples:

dev=> create schema if not exists authorization joe;
CREATE_SCHEMA
dev=> create schema if not exists new_schema authorization joe;
CREATE_SCHEMA
dev=> show schemas;
        Name
--------------------
 information_schema
 public
 pg_catalog
 joe
 new_schema
 rw_catalog
(6 rows)

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Support syntax as follows:

CREATE SCHEMA [ IF NOT EXISTS ] schema_name [ AUTHORIZATION user_name ]
CREATE SCHEMA [ IF NOT EXISTS ] AUTHORIZATION user_name

If the schema name is omitted, the user_name is used as the schema name.