AC-830 Added repository abstraction for formDisplay package

[LuGO0]

Description of what I changed

1. added a method for accessing the dao in the repository.
2. added repository to the presenter .

Issue I worked on

JIRA Issue: https://issues.openmrs.org/browse/AC-830

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 Its done please review, and I think its quite reasonable to let the services make restAPI calls so they dont need to be linked with the repository??
other than this I think this was the only violation present!!

[codecov-commenter]

Codecov Report

Merging #799 into master will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master     #799   +/-   ##
=======================================
  Coverage   13.43%   13.43%           
=======================================
  Files         238      238           
  Lines        9698     9697    -1     
  Branches      931      931           
=======================================
  Hits         1303     1303           
+ Misses       8289     8288    -1     
  Partials      106      106           

Impacted Files	Coverage Δ
...le/activities/formdisplay/FormDisplayActivity.java	0.00% <ø> (ø)
...tivities/formdisplay/FormDisplayMainPresenter.java	0.00% <0.00%> (ø)
...openmrs/mobile/api/repository/VisitRepository.java	68.36% <76.92%> (-1.43%)	⬇️

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[f4ww4z]

LGTM @LuGO0 ! Service can be linked straight to rest API calls for now.