feat: create `dim_course_blocks` for entity lookup (FC-0033)

[SoryRawyer]

This creates a view, dim_course_blocks, that leverages ClickHouse's "direct" join type to improve query performance when adding entity names to larger datasets.

This view could also be used for the dim_course_videos and dim_course_problems datasets that Superset uses for dashboard filters.

Please note: to get this working with Superset, I needed to grant dictGet permissions to the event_sink database for the Aspects reporting user. I can add that in a subsequent PR to use a version of this project that includes this change in the aspects tutor plugin.

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[openedx-webhooks]

@SoryRawyer 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[bmtcril]

Released as v2.3!