feat: Reduce amount of requests to download localization.

[serhii-londar]

Add saving downloaded files timestamps.
Download files only when saved file timestamp is not equal to manifest timestamp.
Add minimum update interval for downloading manifest.

[crowdin-bot]

	Warnings
⚠️	Big PR, try to keep changes smaller if you can

Generated by 🚫 Danger Swift against 50b9006

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 26 lines in your changes missing coverage. Please review.

Project coverage is 61.98%. Comparing base (db1af96) to head (50b9006).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ders/Crowdin/ManifestManager/ManifestManager.swift	73.34%	8 Missing ⚠️
...tionDownloader/CrowdinLocalizationDownloader.swift	70.84%	7 Missing ⚠️
...Crowdin/ManifestManager/FileTimestampStorage.swift	83.34%	4 Missing ⚠️
...ers/Crowdin/CrowdinRemoteLocalizationStorage.swift	33.34%	2 Missing ⚠️
...rs/Crowdin/Extensions/CrowdinSDK+ReactNative.swift	0.00%	2 Missing ⚠️
...wdin/MappingDownloader/CrowdinMappingManager.swift	0.00%	2 Missing ⚠️
...oviders/Crowdin/Config/CrowdinProviderConfig.swift	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
+ Coverage   61.85%   61.98%   +0.13%     
==========================================
  Files         121      122       +1     
  Lines        4325     4395      +70     
==========================================
+ Hits         2675     2724      +49     
- Misses       1650     1671      +21     

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