Summary of the new feature / enhancement

As a user, I would expect Get-Command to mirror command discovery; if I can invoke a command (e.g., uptime) then I should be able to find the command pwsh is invoking with Get-Command.

However, Get-Command uptime returns no results, despite simply calling uptime ending up finding and calling Get-Uptime.

Proposed technical implementation details (optional)

Get-Command should implement the same fallback behaviour used in command discovery; if no results are found and the command contains no verb, the Get- verb should be prepended to try to find the command in the same way command discovery normally would find the command.