refactor: Prepare code for installing older Northstar versions (#305)

* refactor: Rename function

Rename `install_northstar` to `install_latest_northstar` to better
indicate what it does

* refactor: Have updater just call installer

* refactor: Move package selection to calling func

During installation, package should already be known so get package
name earlier as opposed to passing `Option<T>`

* chore: Format fix

* refactor: Allow passing NS version to install

If no version is passed, fallback is to latest

* refactor: Rename function

Back to `install_northstar` from `install_latest_northstar` as the
function can now install any Northstar version

* refactor: Do a borrow instead of clone

* refactor: Use `map` and `unwrap_or`
instead of `match`

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