Environments should have a "reveal in explorer" action

[connor4312]

Testing #457

Similar to #487, it would be handy if there was a "reveal in explorer" context menu action so I could easily navigate from the Python Project view to its file location

[eleanorjboyd]

@cwebster-99 and @karthiknadig thoughts? I know one concern for us was too much clutter in that sidebar so maybe we wait to see if users face this as well?

[cwebster-99]

I think it is less of a concern if this is placed in the context menu as users would only see it then rather than on open

[eleanorjboyd]

so add a new button in the same place as this command:

{
                    "command": "python-envs.reset",
                    "when": "view == python-projects && viewItem =~ /.*python-workspace.*/"
                },

then this command would open the file explorer with the given folder in focus. This new button could be called "reveal project in explorer"