Add type accelerator for ordered

[fflaten]

PR Summary

Adds a type accelerator for [ordered]-> [OrderedDictionary] to enables use of -is, -as and [ordered]::new().

Special OrderedAttribute parser-logic that limits it to only allow cast from hash-literal when used like [ordered]$myVar is kept per WG-decision, see comment in related issue.

PR Context

Fix #10513

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[fflaten]

Tested with vscode-powershell. When writing [ord, IntelliSense shows OrderedDictionary as primary suggestion when using pwsh devbuild.

[ghost]

🎉v7.3.0-preview.7 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes