Converted Config Utils to Kotlin

[madhurgupta10]

Description
Fixes #3673

Tests performed
Tested betaDebug on Google Pixel 2 with API level 29.

[tests-checker]

Could you please add tests to make sure this change works as expected?

[codecov-io]

Codecov Report

Merging #3674 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             master   #3674      +/-   ##
===========================================
- Coverage      6.97%   6.97%   -0.01%     
  Complexity      292     292              
===========================================
  Files           257     257              
  Lines         11736   11738       +2     
  Branches        956     956              
===========================================
  Hits            819     819              
- Misses        10846   10848       +2     
  Partials         71      71              

Impacted Files	Coverage Δ	Complexity Δ
...main/java/fr/free/nrw/commons/utils/ConfigUtils.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...in/java/fr/free/nrw/commons/utils/DownloadUtils.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...fr/free/nrw/commons/media/MediaDetailFragment.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fcd2867...f3e5b79. Read the comment docs.

[neslihanturan]

This PR Will be evaluated after the discussion at #3673 is finalized.