Fixed: Application crash caused by "Input dispatching timed out" while retrieving storageDeviceList information in the online library.

[MohitMaliFtechiz]

Fixes #4163

• Moved the storage device retrieval to the IO thread.
• Updated the StorageDeviceUtils.getWritableStorage method to a suspend function to ensure execution on the IO thread.
• Refactored CopyMoveFileHandler, OnlineLibraryFragment, KiwixPrefsFragment, and LocalLibraryFragment to adapt to this change.
• Optimized storage device retrieval by caching it in the main activity and reusing it across fragments to enhance performance, especially with large SD cards. Because getting it in fragments again and again is quite expensive because when we switch to other screens the previous saved state will lost, and it again tries(when it requires) to get the list of storage devices if we again come back to that fragment.
• Refactored the CopyMoveFileHandlerTest.
• Improved the showing of the storage device list.

[codecov]

Codecov Report

Attention: Patch coverage is 63.49206% with 23 lines in your changes missing coverage. Please review.

Project coverage is 56.95%. Comparing base (3c4614e) to head (7f6f0d4).

Files with missing lines	Patch %	Lines
...le/nav/destination/library/LocalLibraryFragment.kt	0.00%	11 Missing ⚠️
...ile/nav/destination/library/CopyMoveFileHandler.kt	73.91%	1 Missing and 5 partials ⚠️
...e/nav/destination/library/OnlineLibraryFragment.kt	66.66%	4 Missing and 1 partial ⚠️
...ava/eu/mhutti1/utils/storage/StorageDeviceUtils.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4164      +/-   ##
============================================
- Coverage     56.98%   56.95%   -0.04%     
- Complexity     1517     1522       +5     
============================================
  Files           313      313              
  Lines         13399    13402       +3     
  Branches       1662     1666       +4     
============================================
- Hits           7636     7633       -3     
- Misses         4614     4619       +5     
- Partials       1149     1150       +1     

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