Fix document highlight column

[TylerLeonhardt]

fixes PowerShell/vscode-powershell#305

We were originally computing the location by doing:

ast.Extent.Text.IndexOf(ast.Name)

but this is horrible because of cases like function func { } which break it... and not to mention it doesn't include the space before the definition... aka indentation.

Since the AST doesn't tell us where the actual name of the function starts, we need to compute it.

[TylerLeonhardt]

Ok last commit adds:

Support for silly functions like this:

and tests 🎉

[TylerLeonhardt]

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

Complexity increasing per file
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- test/PowerShellEditorServices.Test/Services/Symbols/AstOperationsTests.cs  2
- test/PowerShellEditorServices.Test.E2E/LanguageServerProtocolMessageTests.cs  1
         

See the complete overview on Codacy