Refactor: media models

[ben-mathu]

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

Fixes #4782

Moved media models to data.models package.

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

[codecov[bot]]

Codecov Report

Merging #4864 (0d7021f) into master (87b9648) will decrease coverage by 0.14%. The diff coverage is n/a.

:exclamation: Current head 0d7021f differs from pull request most recent head 60d2591. Consider uploading reports for the commit 60d2591 to get more accurate results

@@             Coverage Diff              @@
##             master    #4864      +/-   ##
============================================
- Coverage     50.66%   50.51%   -0.15%     
+ Complexity     2231     2221      -10     
============================================
  Files           338      336       -2     
  Lines         15531    15537       +6     
  Branches       1358     1359       +1     
============================================
- Hits           7869     7849      -20     
- Misses         7079     7103      +24     
- Partials        583      585       +2     

Impacted Files	Coverage Δ
...ain/java/fr/free/nrw/commons/MediaDataExtractor.kt	18.18% <ø> (ø)
...free/nrw/commons/media/CaptionListViewAdapter.java	20.00% <ø> (ø)
...fr/free/nrw/commons/media/CommonsWikibaseItem.java	0.00% <ø> (ø)
...fr/free/nrw/commons/media/MediaDetailFragment.java	34.10% <ø> (ø)
...fr/free/nrw/commons/review/ReviewPagerAdapter.java	30.76% <0.00%> (-38.47%)	:arrow_down:
...r/free/nrw/commons/explore/media/MediaConverter.kt	71.42% <0.00%> (-23.81%)	:arrow_down:
...ree/nrw/commons/contributions/ContributionDao.java	6.25% <0.00%> (-12.50%)	:arrow_down:
...commons/contributions/ContributionsRepository.java	41.66% <0.00%> (-8.34%)	:arrow_down:
.../java/fr/free/nrw/commons/review/ReviewHelper.java	77.77% <0.00%> (-5.56%)	:arrow_down:
...ns/contributions/ContributionsLocalDataSource.java	16.66% <0.00%> (-4.17%)	:arrow_down:
... and 6 more

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[neslihanturan]

Hi, is this PR sleeping @ben-mathu ?:)