deps command: add --include-implicit flag

[Moisan]

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This is a follow-up of Homebrew/homebrew-core#201901: it adds the --include-implicit flag to brew deps and brew uses.

Once this is merged we can update the scheduled.yml workflow on homebrew-core to use this command instead of the current ruby one-liner.

[MikeMcQuaid]

Thanks! Still needs some work. What is an implicit dependency?

[Moisan]

What is an implicit dependency?

I took the definition of implicit dependency from formula.rb

They are also used in a lot in dependency_collector.rb.

[MikeMcQuaid]

Thanks for explaining! Description needs updated and then should be good to go!