[Feature Request] Support `temporal env get default`

[lorensr]

Is your feature request related to a problem? Please describe.

When I check to see if there's a default env and what the settings are, I get nothing when I do:

temporal env get default

Describe the solution you'd like

Log whatever the default properties are.

Additional context

Note that if I set a default property, it will take effect, and it will show up in env get default

[bergundy]

Hmmm... there technically aren't any defaults for the default env. The defaults are in the CLI and can be seen in the help output. You can override those defaults and those will show up when you get env.

[lorensr]

I think it would be helpful if it appeared as an env with values even if it isn't implemented that way. That way I can:

1. discover with env list that there is a default env
2. get the sense that I'm able to modify default
3. see the default properties in one place