[Feature] Improve manifest "persist"

[milnak]

Feature Request

Is your feature request related to a problem? Please describe.

Manifest "persist" assumes the object to be persisted is a folder, and very often its not.

    "persist": [
        "state.bin",
        "folder"
    ]

because of this, almost every manifest forces an empty file to be created, e.g.

    "pre_install": [
        "'state.bin' | ForEach-Object { New-Item -Path (Join-Path -Path $dir -ChildPath $_) -ItemType File -ErrorAction SilentlyContinue | Out-Null }"
    ],

Describe the solution you'd like

would be great to be able to optionally specify a type, e.g.

    "persist": [
        { "state.bin", "File" },
        { "folder", "Directory" }
    ]

and therefore, scoop wouldn't need to have a pre-existing object in the $dir folder.

Describe alternatives you've considered