feat: add dataset for pageview engagement charts (FC-0051)

[SoryRawyer]

This PR adds a dataset that can be used to show the number of learners who have:

1. viewed at least one page in a section or subsection
2. viewed all pages in a section or subsection

This is still a draft because I wanted to give a more elaborate example of how I imagined using the models added in my recent aspects-dbt PR.

Here is a chart that I made from this dataset:

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[bmtcril]

@SoryRawyer I haven't had a chance to review yet, but I think the CI errors can be fixed with a rebase

[SoryRawyer]

@bmtcril I don't think I'm missing any commits from main. Do you have any ideas what else might be causing the Docker hub login step to fail?

[Ian2012]

@SoryRawyer can you add this chart to the Instructor Dashboard too?

[bmtcril]

I think this is failing due to secrets not being available since you don't have write on the repo. I suspect this will happen with forks, too. We can merge with these failures, but if we don't 100% need those images to build we might want to just skip those when they can't run (if that's even possible)?

[bmtcril]

I think this just needs another rebase to get the latest changes to the build-image workflow and it should be good to go!

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