Add nushell

[doubleailes]

Here is a draft PR to start discussion in parallel of Nushell's team to add the fix/features link in the issue: https://github.com/spkenv/spk/issues/1105

This branch with Nushell 0.96.0+ support interactive shell but not command.

But it show error trying to autoload bash and tcsh files enough for testing purpose.

[rydrman]

Looks like great progress, let us know if you need any other support while you wait for the necessary nu features