[WIP]Parser: Move CREATE statement parsing into parser/create.rs

[s5dsn-eqee]

WIP

[github-actions]

No dialect label was applied because the title does not name a SQL dialect.

If this change targets one or more dialects, edit the title to <Dialect>[, <Dialect>]: <description>, add a Dialects: <Dialect>[, <Dialect>] line to the description, or reply with one. Reply Dialects: none if the change is dialect-agnostic.