This brings the scoops feature a bit more closer to similar pipes, like
brew and krew.
- It now supports multiple scoops
- It improves some validations to prevent wrong manifests
- It uses extra.binaries instead of extra.builds, as brew does too
- extra.builds is now unused, will be removed in a subsequent PR
- More tests were added as well
closes#3941
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Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>