Is your feature request related to a problem? Please describe.
I need order by a column with the NULLS LAST/NULLS FIRSTcondition (postgres)

Describe the solution you'd like
Maybe we can extend QueryOrder Enum:

export declare enum QueryOrder {
    ASC = "ASC",
    ASC_NULLS_LAST = "ASC NULLS LAST",
    ASC_NULLS_FIRST = "ASC NULLS FIRST",
    DESC = "DESC",
    DESC_NULLS_LAST = "DESC NULLS LAST",
    ...
}

Describe alternatives you've considered
As a workaround, I'm using queryBuilder (knex) for doing it, but I would like to do that from Entity Repository methods.

I would be happy to make a pull request with this feature, but I would need you to point me in the right direction. Do we need modify anything else? Maybe here?