Exposures support metrics

[MichelleArk]

resolves #6057

Description

🎩 Did some manual tophatting to confirm lineage is visualized as expected with exposures dependent on metrics:

Checklist

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[jtcohen6]

I think just a (functional?) test where we define an exposure that depends on a metric, and validate that the value appears in the appropriate node properties (metrics, depends_on.nodes).

exposures:
  - name: some_exposure
    depends_on:
      - metric('some_metric')

And then this will be good to go! Nice work making it happen

[gshank]

Looks good!