Micromamba support

[flying-sheep]

In order to support micromamba, I changed the completion in the conda.nu module to:

def get-envs [] {
    micromamba env list --json | from json | get envs | each { |p| { path: $p, name: ($p | path basename) } }
}

def 'nu-complete conda envs' [] {
    get-envs | get name
}

and the first lines of export def-env activate to:

let envs = (get-envs)
let env_dir = ($envs | where name == $env_name | get path | first)

[fdncred]

I'm assuming this is more of a tip than an issue. If that's the case. We can just close this and people who search for micromamba can find it.

[flying-sheep]

we could change it to autodetect.

let flavor = if (which conda | length) == 0 { 'conda' } else if ... else { make error { ... }}

[fdncred]

we could change ...

Sure. If someone wants to submit that to close this issue. I'm cool with that.

[AucaCoyan]

fixed by #800 can you try again @flying-sheep ?

[flying-sheep]

Looks good!