AC-832 Migrating type converter package to kotlin and fixing minor issue with type converters

[LuGO0]

Description of what I changed

1. Fixed some irregularities in type converters
2. Deleted one redundant type converter
3. Converting the package to kotlin

Issue I worked on

JIRA Issue: https://issues.openmrs.org/browse/AC-832

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.

[LuGO0]

@f4ww4z @rishabh-997 please check up the changes once before I convert them into kotlin!!

[codecov-commenter]

Codecov Report

Merging #811 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #811   +/-   ##
=======================================
  Coverage   13.64%   13.64%           
=======================================
  Files         237      236    -1     
  Lines        9552     9552           
  Branches      917      918    +1     
=======================================
  Hits         1303     1303           
  Misses       8143     8143           
  Partials      106      106           

Impacted Files	Coverage Δ
.../models/typeConverters/AllergyReactionConverter.kt	0.00% <0.00%> (ø)
...ile/models/typeConverters/FormResourceConverter.kt	0.00% <0.00%> (ø)
.../models/typeConverters/ObservationListConverter.kt	0.00% <0.00%> (ø)
...le/models/typeConverters/PersonAddressConverter.kt	0.00% <0.00%> (ø)
.../models/typeConverters/PersonAttributeConverter.kt	0.00% <0.00%> (ø)
...rs/mobile/models/typeConverters/PersonConverter.kt	0.00% <0.00%> (ø)
...obile/models/typeConverters/PersonNameConverter.kt	0.00% <0.00%> (ø)
...odels/typeConverters/ProviderAttributeConverter.kt	0.00% <0.00%> (ø)
.../org/openmrs/mobile/utilities/PatientComparator.kt	0.00% <0.00%> (ø)
... and 7 more

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[rishabh-997]

Changes are fine, you can migrate them to kotlin 👍

[LuGO0]

@rishabh-997 i will convert them into kotlin soon just caught up in some work, will make the PR ready for review then 👍

[rishabh-997]

Nice work @LuGO0, can you try to fix the Travis failure...

[LuGO0]

@rishabh-997 I think its not a travis failure but actually travis failed to start test can you restart the travis test for this commit !!

[LuGO0]

@rishabh-997 I rebased its fine now :)

[LuGO0]

@rishabh I encountered No NPEs while normal usage.