Added EncounterFlat and ConditionFlat examples

[bashir2]

Added two examples from Open Health Stack flattening ViewDefinitions (specifically from here).
Note that the publisher tool fails on this PR with an NPE as discussed/fixed in this other PR.

[johngrimes]

Thanks @bashir2!

This looks fine to me, but I feel like we should wait until the the fix makes it into the IG publisher before merging.

Otherwise I don't know how we can continue to build our IG successfully...

[bashir2]

Thanks @bashir2!

This looks fine to me, but I feel like we should wait until the the fix makes it into the IG publisher before merging.

Otherwise I don't know how we can continue to build our IG successfully...

Thanks @johngrimes. Yeah that's correct; I won't merge this until my fix to the publisher tool is merged and released.

[bashir2]

@johngrimes I think the publisher tool has been finally fixed/released and I think we can merge this PR now (the publisher tool does not produce the NPE on this change anymore). I know you are in the process of generating a release candidate for SQL-on-FHIR IG, so please merge this when the time is right.