DRAFT: Added Data Merge Step With 3 Domains

[codecov-commenter]

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[pburnsdata]

Based on meeting Sep 22:

• Update settings list to include new domains (https://github.com/SafetyGraphics/nep-explorer/blob/5306801316e0e7744f3b578dbd603d5265604f15/R/create_nepexplorer_app.R#L25C2-L25C2)
• Use these settings to make sure that the join happens on the right columns even when they differ between datasets
  • For join we would need the following consistent: subject ID, measure column, measure values, and maybe measure unit(?)