Make DeviceType enum public

[JonathanAquino-NextRoll]

The DeviceType enum is something that would be handy for consumers to use, for example, to test if a user agent is a specific device type. However, it is private.

Repro steps

println!(
    "{:?}",
    rust_device_detector::parsers::device::DeviceType::Desktop
);

// Expected: The device type is printed.
// Actual: The following compilation error occurs:

module `device` is private
private modulerustc[Click for full compiler diagnostic](rust-analyzer-diagnostics-view:/diagnostic%20message%20[0]?0#file:///Users/jonaquino/projects/omnom-and-sludge/sludge/batch_jobs/src/uap.rs)
uap.rs(414, 64): unit variant `Desktop` is not publicly re-exported
parsers.rs(3, 1): the module `device` is defined here

[mindreader]

That's a good point. If I pick this up again, I think I would make that change.