Ability to display Dependency relations between cards

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Is your feature request related to a problem? Please describe.
Sometimes there are dependency relations between some cards/tasks and it is difficult to manage those on Deck with its current implementations.

Describe the solution you'd like
Similar to #2103, but not related to hierarchy but dependency. This means that the cards are not a group of subtasks, but that they have a dependency relation.
The cards could be dragged to right below other card to show a dependency relation:

Not having such a feature, makes difficult to know which card is dependent to other and thus, unable to start doing until that other is finished. I would not know how to solve this with columns.

Start by reviewing the dependency behavior described here and the related hierarchy issue #2103. Define how a dependency should be represented and displayed when cards are positioned together, including how users identify which card blocks another. Done should include an agreed interaction and implementation scope, but the issue does not name files or tests.