Alias `fmu_copy_revision` here

We currently expose `fmu copy` which is a copy of `fmu_copy_revision` from subscript:

https://github.com/equinor/subscript/tree/main/src/subscript/fmu_copy_revision

Once this package goes to Komodo stable, we should alias the `fmu_copy_revision` as a command here and remove it from subscript. This effectively means we begin maintaining the code as well as improving it such that it works nicely with .fmu.

It needs to be added here, and removed from subscript, coordinated and in the same Komodo release.