Rename PSScriptFileInfo and Get-PSResource cmdlets

[adityapatwardhan]

PR Summary

Rename the cmdlets New-PSScriptFileInfo, Test-PSScriptFileInfo and Get-PSResource. For more details look at: #919

PR Context

Fixes #919

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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[PaulHigin]

LGTM once all of the tests run successfully.

[anamnavi]

LGTM