Prerequisites

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Summary

Powershell has a completion API for commands that prioritizes things such as camelcase letters. For instance the first completion for g-arg is Get-AzureResourceGroup.

If possible, we should use this API and prioritize those results to the top of the list, rather than the default lexical search vscode does. This will more closely match the editor experience to the shell experience.
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TBD whether this should be the default behavior or an opt-in, but either way it should be controllable via a setting.

Proposed Design

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