brew deps: support --full-name in --installed, --all, and --tree modes

[apjanke]

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Fixes #1692. See it for details.

Currently, the --all, --installed, and --tree modes ignore the --full-name option. This makes them respect it.

I haven't added new tests for this because I think that would require having a non-default tap tapped. The tap_test.rb file has code for setting up a tap, and that could be reused here with some refactoring, but that seems like overkill for this change.

[MikeMcQuaid]

Think you can do .map(&method(:dep_display_name)).uniq here

[MikeMcQuaid]

Similarly here.

[MikeMcQuaid]

I think a .join is a bit more readable here but no strong preference.

[MikeMcQuaid]

I haven't added new tests for this because I think that would require having a non-default tap tapped. The tap_test.rb file has code for setting up a tap, and that could be reused here with some refactoring, but that seems like overkill for this change.

Seems fine 👍

[apjanke]

Amended to address code comments and merged.