Refactor: nearby models

[ben-mathu]

Part of an ongoing code refactoring to move all models to a common models package.

Fixes #4782

Moved nearby models to data.models package.

Tested debug on Pixel 4 (Emulator) with API level 30.

[codecov[bot]]

Codecov Report

Merging #4865 (6ea3911) into master (87b9648) will decrease coverage by 0.20%. The diff coverage is n/a.

:exclamation: Current head 6ea3911 differs from pull request most recent head 3b4d85e. Consider uploading reports for the commit 3b4d85e to get more accurate results

@@             Coverage Diff              @@
##             master    #4865      +/-   ##
============================================
- Coverage     50.66%   50.45%   -0.21%     
+ Complexity     2231     2189      -42     
============================================
  Files           338      335       -3     
  Lines         15531    15375     -156     
  Branches       1358     1343      -15     
============================================
- Hits           7869     7758     -111     
+ Misses         7079     7037      -42     
+ Partials        583      580       -3     

Impacted Files	Coverage Δ
...okmarks/locations/BookmarkLocationsController.java	100.00% <ø> (ø)
...mons/bookmarks/locations/BookmarkLocationsDao.java	81.66% <ø> (ø)
...bookmarks/locations/BookmarkLocationsFragment.java	81.48% <ø> (ø)
...ategory/CategoryEditSearchRecyclerViewAdapter.java	28.57% <ø> (ø)
.../commons/contributions/ContributionController.java	10.86% <ø> (ø)
...w/commons/contributions/ContributionsFragment.java	31.59% <ø> (-0.33%)	:arrow_down:
...r/free/nrw/commons/contributions/MainActivity.java	76.00% <ø> (ø)
...fr/free/nrw/commons/media/MediaDetailFragment.java	34.10% <ø> (ø)
...fr/free/nrw/commons/mwapi/OkHttpJsonApiClient.java	16.20% <ø> (ø)
.../fr/free/nrw/commons/nearby/CheckBoxTriStates.java	59.57% <ø> (ø)
... and 39 more

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