Update packages listed in jupyter --version

[kevin-bates]

Seems like we should include jupyter_server in the jupyter --version output. While updating, I made the following changes:

1. Use package names and not logical "application" names since the latter introduced inconsistencies and package names are what folks equate with version information.
2. Sort packages alphabetically
3. Add jupyter_server and nbclient
4. Add indicator that these are "selected packages" (i.e., it's not a complete list)

Here's the before and after output (on my system)...
Before...

$ jupyter --version
jupyter core     : 4.7.1
jupyter-notebook : 6.2.0
qtconsole        : not installed
ipython          : 7.23.0
ipykernel        : 5.5.5
jupyter client   : 7.0.0.dev
jupyter lab      : 3.0.4
nbconvert        : 6.0.7
ipywidgets       : not installed
nbformat         : 5.1.2
traitlets        : 5.0.5

After...

$ jupyter --version
Selected Jupyter core packages...
IPython          : 7.23.0
ipykernel        : 5.5.5
ipywidgets       : not installed
jupyter_client   : 7.0.0.dev
jupyter_core     : 4.8.0.dev0
jupyter_server   : 1.9.0.dev0
jupyterlab       : 3.0.4
nbclient         : 0.5.3
nbconvert        : 6.0.7
nbformat         : 5.1.2
notebook         : 6.2.0
qtconsole        : not installed
traitlets        : 5.0.5

[MSeal]

LGTM