Add "ceph-nvmeof" cli command to use it as a CLI
instead of containers.

Signed-off-by: Vallari Agrawal <[email protected]>

Official releases would be published to
https://pypi.org/project/ceph-nvmeof/
on every tag releases on github.

Dev releases would be published to
https://test.pypi.org/project/ceph-nvmeof/
on every merge to "devel" branch.

Package will override if the version already exists.
For example, if "1.2.15" already exists on test.pypi
and the new commit also has same version (in pyproject.toml),
then that package would be overwritten (by using a bigger
build number).

Signed-off-by: Vallari Agrawal <[email protected]>

Signed-off-by: Vallari Agrawal <[email protected]>

"--server-address" defaults to env variable
CEPH_NVMEOF_SERVER_ADDRESS (otherwise "localhost").

"--server-port" defaults to env variable
CEPH_NVMEOF_SERVER_PORT (otherwise 5500).

This is to avoid repetitive inputs. If these
environment variables are set, we can just do:
`ceph-nvmeof gw info`.
(instead of current `ceph-nvmeof --server-address /
$NVMEOF_SERVER_ADDRESS --server-port /
$NVMEOF_SERVER_PORT gw info`)

Signed-off-by: Vallari Agrawal <[email protected]>