Introduce Get-EditorServicesParserAst to expand on ExpandAlias

[romero126]

Get-EditorServicesParserAst will allow for ExpandAlias or other ast features to look at comment blocks or Functions defined.

This also addresses an issue with running the Module in Constrained Language Mode.

[TylerLeonhardt]

Here is an overview of what got changed by this pull request:

Issues
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- Added 1
           

Complexity increasing per file
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- src/PowerShellEditorServices.Hosting/Commands/GetEditorServicesParserAst.cs  3
         

See the complete overview on Codacy

[andyleejordan]

Sorry, just going to close this, it's been 4 years. Still up for grabs if someone wants to improve the way that expand alias function works. It's still a TODO.