OptionalallowAllow a __-prefixed schema name that is outside the __mj_<AppName> app namespace
(which needs no override). Exact-match reserved names (__mj, __mj_UDT, dbo, …)
remain blocked regardless of this flag. Dangerous; MJ-internal apps only.
OptionalCoreMJ core schema whose owner the new app schema should share (SQL Server only — see
CreateAppSchema). Defaults to __mj.
Options for CreateAppSchema.