nu_conda list should show which environments are activated

[brunerm99]

It would be nice if the nu_conda list command in the nu_conda module would show which environment is activated.

I modified and will submit a PR to change the behavior from outputting (example on my system):

➜ nu_conda list
╭──────┬─────────────────────────────────────╮
│ base │ /home/marchall/.anaconda3           │
│ data │ /home/marchall/.anaconda3/envs/data │
╰──────┴─────────────────────────────────────╯

to:

➜ nu_conda list
╭───┬──────┬────────┬─────────────────────────────────────╮
│ # │ name │ active │                path                 │
├───┼──────┼────────┼─────────────────────────────────────┤
│ 0 │ base │ false  │ /home/marchall/.anaconda3           │
│ 1 │ data │ true   │ /home/marchall/.anaconda3/envs/data │
╰───┴──────┴────────┴─────────────────────────────────────╯

Also, this way you get a pipeable output instead of just printing $env.CONDA_ENVS.

[fdncred]

closed by #604