Add UCUM support

[jamesagnew]

No description provided.

[codecov]

Codecov Report

Merging #1824 into master will increase coverage by 0.00%.
The diff coverage is 87.73%.

@@            Coverage Diff             @@
##             master    #1824    +/-   ##
==========================================
  Coverage     81.23%   81.23%            
- Complexity    13990    14054    +64     
==========================================
  Files           964      965     +1     
  Lines         52485    52653   +168     
  Branches       8387     8414    +27     
==========================================
+ Hits          42635    42774   +139     
- Misses         6656     6671    +15     
- Partials       3194     3208    +14     

Impacted Files	Coverage Δ	Complexity Δ
.../src/main/java/ca/uhn/fhir/util/ClasspathUtil.java	77.14% <77.14%> (ø)	11.00 <11.00> (?)
...n/support/CommonCodeSystemsTerminologyService.java	96.55% <86.20%> (-1.04%)	21.00 <5.00> (+7.00)	⬇️
...rt/InMemoryTerminologyServerValidationSupport.java	82.02% <97.36%> (+0.16%)	75.00 <6.00> (+5.00)
...va/ca/uhn/fhir/validation/SchemaBaseValidator.java	87.09% <100.00%> (+4.07%)	8.00 <0.00> (-1.00)	⬆️
...a/model/entity/ResourceIndexedSearchParamDate.java	84.67% <0.00%> (-3.42%)	54.00% <0.00%> (+23.00%)	⬇️
...java/ca/uhn/fhir/jpa/model/entity/ModelConfig.java	91.93% <0.00%> (-2.90%)	27.00% <0.00%> (+1.00%)	⬇️
...in/java/ca/uhn/fhir/rest/param/DateRangeParam.java	79.43% <0.00%> (-2.57%)	90.00% <0.00%> (+6.00%)	⬇️
...idation/support/PrePopulatedValidationSupport.java	82.00% <0.00%> (-2.00%)	13.00% <0.00%> (-1.00%)
... and 4 more

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