Add `decorator` package as a PyRosetta dependency (#746)
This PR patches a nascent bug in the `pyrosetta.distributed` required
dependencies:
`source/src/python/PyRosetta/src/pyrosetta/distributed/utility/log.py`
imports the `decorator` package, although it's not explicitly declared
as a dependency in either the unit tests or the
[`pyrosetta-distributed`](https://www.piwheels.org/project/pyrosetta-distributed/)
meta-package. Currently, the PyRosetta unit tests indirectly rely on the
`decorator` package to be installed via the `jupyter` -> `ipykernel` ->
`ipython` -> `decorator` dependency chain, and `ipython` seems to have
removed it as a dependency in their latest 9.16.0 version (see the
following PR: https://github.com/ipython/ipython/pull/15310).