Add IPS Generator

[jamesagnew]

This PR adds a generation API for International Patient Summary (IPS) documents. As a part of implementing this, I also reworked the narrative generator to improve profile support, add thymeaf fragment template support, and added a method to generate narratives without populating any resources.

[michaelabuckley]

Neat. Minor comments/questions.

[codecov]

Codecov Report

Base: 81.32% // Head: 81.35% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (4fab7c9) compared to base (2f5ffe7).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4438      +/-   ##
============================================
+ Coverage     81.32%   81.35%   +0.02%     
- Complexity    23650    23795     +145     
============================================
  Files          1425     1432       +7     
  Lines         86399    87219     +820     
  Branches      11677    11768      +91     
============================================
+ Hits          70265    70956     +691     
- Misses        10947    11035      +88     
- Partials       5187     5228      +41     

Impacted Files	Coverage Δ
ca/uhn/fhir/mdm/api/MdmQuerySearchParameters.java	49.31% <0.00%> (-35.94%)	⬇️
org/hl7/fhir/r5/hapi/fhirpath/FhirPathR5.java	40.74% <0.00%> (-28.01%)	⬇️
...a/uhn/fhir/jpa/mdm/svc/MdmLinkQuerySvcImplSvc.java	41.66% <0.00%> (-25.00%)	⬇️
org/hl7/fhir/r4/hapi/fluentpath/FhirPathR4.java	62.96% <0.00%> (-24.54%)	⬇️
.../hl7/fhir/dstu3/hapi/fluentpath/FhirPathDstu3.java	76.00% <0.00%> (-17.75%)	⬇️
ca/uhn/fhir/jpa/mdm/svc/MdmControllerSvcImpl.java	63.44% <0.00%> (-9.40%)	⬇️
...r/narrative/CustomThymeleafNarrativeGenerator.java	94.73% <0.00%> (-5.27%)	⬇️
ca/uhn/fhir/system/HapiSystemProperties.java	76.47% <0.00%> (-4.78%)	⬇️
...rch/PersistedJpaSearchFirstPageBundleProvider.java	95.65% <0.00%> (-2.03%)	⬇️
ca/uhn/fhir/rest/api/MethodOutcome.java	81.03% <0.00%> (-1.66%)	⬇️
... and 57 more

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[riobennin]

Thank you @jamesagnew for your painstaking and elegant work! I have added some notes here to compare to the original functionality and few spots where I'm not sure it's behaving entirely as intended. Sorry these comments are coming on a closed PR. I only became aware the work was done after it was already closed.