FM2-602: Add support for XML PATCHing operations - Encounter Resource

[mherman22]

Description of what I changed

This ticket introduces XML PATCH operations on the Encounter Resource.

For example the following xml doc should be supported:

<diff xmlns:fhir="http://hl7.org/fhir"> 
   <replace sel="/fhir:Encounter/fhir:period/fhir:start/@value">                  
        2005-02-01T00:00:00+05:30       
   </replace>
</diff>

Issue I worked on

see https://issues.openmrs.org/browse/FM2-602

Checklist: I completed these to help reviewers :)

• My IDE is configured to follow the code style of this project.

  No? Unsure? -> configure your IDE, format the code and add the changes with git add . && git commit --amend

• I have added tests to cover my changes. (If you refactored
  existing code that was well tested you do not have to add tests)

  No? -> write tests and add them to this commit git add . && git commit --amend

• I ran mvn clean package right before creating this pull request and
  added all formatting changes to my commit.

  No? -> execute above command

• All new and existing tests passed.

  No? -> figure out why and add the fix to your commit. It is your responsibility to make sure your code works.

• My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master

[codecov]

Codecov Report

Patch coverage: 82.61% and no project coverage change.

Comparison is base (42b8c45) 77.24% compared to head (7d2db0c) 77.25%.

❗ Current head 7d2db0c differs from pull request most recent head 849f6c3. Consider uploading reports for the commit 849f6c3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #506   +/-   ##
=========================================
  Coverage     77.24%   77.25%           
+ Complexity     2648     2647    -1     
=========================================
  Files           246      246           
  Lines          7426     7423    -3     
  Branches        911      910    -1     
=========================================
- Hits           5736     5734    -2     
  Misses         1142     1142           
+ Partials        548      547    -1     

Impacted Files	Coverage Δ
...mrs/module/fhir2/api/impl/FhirTaskServiceImpl.java	71.43% <ø> (ø)
...translators/impl/BaseServiceRequestTranslator.java	0.00% <0.00%> (ø)
...g/openmrs/module/fhir2/api/util/XmlPatchUtils.java	0.00% <ø> (ø)
...ers/r4/AllergyIntoleranceFhirResourceProvider.java	73.91% <0.00%> (ø)
...r2/providers/r4/ConditionFhirResourceProvider.java	60.87% <ø> (ø)
...ir2/providers/r4/LocationFhirResourceProvider.java	72.73% <ø> (ø)
...fhir2/providers/r4/PersonFhirResourceProvider.java	71.43% <ø> (ø)
...odule/fhir2/api/search/param/TaskSearchParams.java	73.33% <91.67%> (ø)
.../api/translators/impl/EncounterTranslatorImpl.java	90.70% <100.00%> (ø)
...translators/impl/ServiceRequestTranslatorImpl.java	95.35% <100.00%> (ø)
... and 2 more

... and 3 files with indirect coverage changes

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