O3-1661: mostRecentObsValueBefore data source in AMPATH forms.

[hadijahkyampeire]

Requirements

• This PR has a title that briefly describes the work done, including the ticket number if there is a ticket.

Summary

• Adds a data source that has a function that returns all obs values before a given date.

Screenshots

This is an example of the logs showing all obs/concepts and filtered ones based on the date supplied

Issue

mostRecentObsValueBefore data source in AMPATH forms

Other

• I used the mock-obs, and I wasn't sure of the date format which will be passed, so this is not yet perfect, it is based on assumptions of a date format and some hardcording.

[ibacher]

So there are two "apps" in this repository, a simple app for testing things and the actual engine. This adds a data source to the testing app. I'm not sure I see why we would merge this PR as-is? (The testing app isn't actually used in the patient chart, so this doesn't add any real functionality; I'm also unclear how the proposed data source is supposed to function in the real world?).

I'd assume that the function can be passed a real Javascript date, so the string mangling shouldn't be necessary...

[hadijahkyampeire]

Closing this, the work to cover this has been moved to patient chart in this PR