This is a follow-up PR of #186, because of the renaming of the new named block.

function Get-Foo {
    [CmdletBinding()]
    param()

    begin { }
    process { }
    end { }
    clean { }
}

Reference PowerShell/PowerShell#15177 for indication on when the feature will become available.
PowerShell/PowerShell#15177 did some design changes based on the original PR PowerShell/PowerShell#9900

/cc @andschwa and @vexx32