Mov batch downloader to async/await part#1

[codecov-commenter]

Codecov Report

Merging #428 (8a83d69) into main (1f8e74e) will decrease coverage by 0.20%. The diff coverage is 80.33%.

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@@            Coverage Diff             @@
##             main     #428      +/-   ##
==========================================
- Coverage   78.09%   77.89%   -0.20%     
==========================================
  Files         179      178       -1     
  Lines        6611     6592      -19     
==========================================
- Hits         5163     5135      -28     
- Misses       1448     1457       +9     

Impacted Files	Coverage Δ
...chDownloader/Downloader/DownloadsPersistence.swift	92.66% <ø> (ø)
...es/BatchDownloader/Downloader/NetworkSession.swift	0.00% <0.00%> (ø)
...s/QuranAudioKit/AudioPlayer/QuranAudioPlayer.swift	93.60% <0.00%> (-0.76%)	:arrow_down:
...es/TranslationService/TranslationsDownloader.swift	0.00% <0.00%> (ø)
...es/Utilities/Extensions/PromiseKit+Extension.swift	35.00% <35.71%> (+1.66%)	:arrow_up:
...QuranAudioKit/Downloads/AyahsAudioDownloader.swift	47.05% <42.85%> (-4.46%)	:arrow_down:
Sources/Utilities/Features/Attempt.swift	77.77% <77.77%> (ø)
...tchDownloader/Entities/DownloadBatchResponse.swift	96.55% <80.00%> (-3.45%)	:arrow_down:
...s/BatchDownloader/Downloader/DownloadManager.swift	74.35% <80.95%> (-2.79%)	:arrow_down:
...ests/BatchDownloaderTests/NetworkSessionFake.swift	84.50% <84.84%> (+4.50%)	:arrow_up:
... and 11 more