Add "pwsh" to shell.py

[kkthxbye]

Allow poetry shell to properly activate a python virtual environment when the user shell is pwsh

poetry shell on pwsh (https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_pwsh) uses the default incompatible /bin/activate, which means you have to hack your way around with something like

. $($(poetry debug | sls Path).ToString().Trim() | % { $($_ -split '\s+', 0, 'regexmatch')[1] + '/bin/activate.ps1' })

instead.

[kkthxbye]

Resolved in #5053

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