Add macros to depends_on list for nodes that can call macros

[drewbanin]

Describe the feature

The depends_on list for model, snapshot, analysis, and data test nodes should include the list of macros that the node depends on. I think this was the behavior at some point in the past, but we never really used this information if it was previously supported. As a part of #2068, we're going to want to add macros to the docs site. Accordingly, we'll want to see the macros that a model depends on inline in the generated docs.

Longer term, I think we'll also want to see the macros that a macro depends on, but my instinct is that this would be substantially more involved than the equivalent work for nodes. If that's not the case, then that would be very worthwhile here as well.

Use cases

• Documentation