Need to be able to search module based on command alias

[SteveL-MSFT]

Find-Command from PowerShellGet depends on PowerShellGallery search capability to find modules based on commands, but PowerShellGallery doesn't support searching based on an alias and only supports command names.

find-command pumo

This should return PowerShellGet as pumo is an alias for publish-module. This was reported from AzPowerShell team where users are trying to find out which Az module they need to install based off the alias of a cmdlet.