cider set-default to handle array values

[RogerThiede]

Cider storage of defaults and applying defaults doesn't appear to support arrays.

Example usage:
defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="spacer-tile";}'

[RogerThiede]

My intention is to be able to save new persistent applications into the Dock.
Since my common usage of Cider is when installing new macOS versions which keep changing the default value of com.apple.dock persistent-apps, I don't want cider apply-defaults to erase the entire persistent-apps value.

[msanders]

This issue has been migrated to zero-sh/apply-user-defaults#1.