feat(version): add spinner while checking upstream versions

It may take quite some time to check a lot of upstream versions.
However, we still want to nicely group the results together. To avoid
just showing a static status message it makes much more sense to show a
dynamic spinner with a summary of the progress.

Component: pkgctl version check
Component: pkgctl version upgrade
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

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