AC-811 Allergy can be updated as per server settings

[rishabh-997]

Description of what I changed

1. Since allergen is fixed once created, so haven't given option to change it
2. Added allergenType field in AllergyEntity
3. Created appropriate rest calls

Issue I worked on

JIRA Issue: https://issues.openmrs.org/browse/AC-811

Checklist: I completed these to help reviewers :)

• My pull request only contains ONE single commit
  (the number above, next to the 'Commits' tab is 1).

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

• All new and existing tests passed.

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

[rishabh-997]

Since I have updated the allergyEntity, so you will need to clear app data to test this @f4ww4z sir. Hopefully, this marks the end of the Allergy Module in Android Client.

[codecov-commenter]

Codecov Report

Merging #798 into master will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   13.52%   13.43%   -0.10%     
==========================================
  Files         238      238              
  Lines        9632     9698      +66     
  Branches      924      931       +7     
==========================================
  Hits         1303     1303              
- Misses       8223     8289      +66     
  Partials      106      106              

Impacted Files	Coverage Δ
...ivities/addeditallergy/AddEditAllergyActivity.java	0.00% <0.00%> (ø)
...ivities/addeditallergy/AddEditAllergyFragment.java	0.00% <0.00%> (ø)
...vities/addeditallergy/AddEditAllergyPresenter.java	0.00% <0.00%> (ø)
...ies/patientdashboard/PatientDashboardActivity.java	0.00% <0.00%> (ø)
...tientdashboard/allergy/PatientAllergyFragment.java	3.38% <0.00%> (-0.19%)	⬇️
...enmrs/mobile/api/repository/AllergyRepository.java	21.27% <0.00%> (-4.37%)	⬇️
.../org/openmrs/mobile/databases/AppDatabaseHelper.kt	0.00% <0.00%> (ø)
...openmrs/mobile/databases/entities/AllergyEntity.kt	0.00% <0.00%> (ø)

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[HerbertYiga]

thanks @rishabh-997 cc @f4ww4z

[f4ww4z]

LGTM @rishabh-997