Give the CLI an option for outputting as an array and/or JSON Lines

[jwodder]

Since the CLI will output multiple objects when given multiple wheels, it seems only natural that the output should be a JSON array, either by default or when given a certain command-line option. Moreover, there should probably be an option for outputting a stream of objects as JSON Lines.

Alternatively, perhaps inspecting more than one wheel at once with the CLI should be forbidden?