Add instance Consumable/Dupable/Movable for ByteString and Text

[Bodigrim]

linear-base already depends on bytestring (via hashable) and text. It would be awesome to provide Consumable, Dupable and Movable instances for ByteString and Text, because they cannot be defined in respective packages. I could have used them in https://github.com/Bodigrim/linear-builder/

[aspiwack]

I'm a bit swamped right now, but I just had a look. I think both can work indeed: their data is entirely unpacked, and doesn't contain thunks. There is just a thunk at toplevel, so we can use something like

Unsafe.toLinear $ \s -> s `seq` Ur s

as the implementation of move.