Support `{h-schema}`, `{h-domain}`, or `{h-catalog}` in native query

[DavideD]

See https://docs.jboss.org/hibernate/orm/6.3/userguide/html_single/Hibernate_User_Guide.html#sql-global-catalog-schema

[gavinking]

@sebersole is this still a documented feature or is it something that's been deprecated or is being phased out?

[sebersole]

I wasn't planning on removing it no

[gavinking]

OK thanks then we should support it: