feat: support for POWERSHELL_CONFIG_FILE

[x-delfino]

Proposed changes

Support POWERSHELL_CONFIG_FILE to specify custom file name for PSScriptAnalyzer config

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[ferrarimarco]

Hi @x-delfino !

Thanks for this PR!

[x-delfino]

Just thinking - is there any reason not to add this for all linters that support a config file? Should be a fairly straightforward change and can leave the current values as defaults

[ferrarimarco]

There isn't any reason for not doing this. Feel free to send follow-up PRs to address that. We'll happily review them.

Thanks a lot!