[CIS-803] Change fetching devices to be called explicitly

[nuno-vieira]

In this PR

• Removes CurrentUserUpdater.fetchDevices() call from CurrentUserController.synchronize()
• Adds CurrentUserController.synchronizeDevices()

[VojtaStavik]

Great. I have a nit comment about naming + CHANGELOG and we're good to merge 👍

[codecov]

Codecov Report

Merging #1010 (8b83d3c) into main (8bd1e46) will decrease coverage by 0.19%.
The diff coverage is 94.44%.

❗ Current head 8b83d3c differs from pull request most recent head e71d6a5. Consider uploading reports for the commit e71d6a5 to get more accurate results

@@            Coverage Diff             @@
##             main    #1010      +/-   ##
==========================================
- Coverage   89.73%   89.53%   -0.20%     
==========================================
  Files         210      210              
  Lines        8758     8774      +16     
==========================================
- Hits         7859     7856       -3     
- Misses        899      918      +19     

Flag	Coverage Δ
llc-tests	89.53% <94.44%> (-0.03%)	⬇️
llc-tests-ios12	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Sources/StreamChat/Workers/ChatClientUpdater.swift	97.91% <50.00%> (ø)
Sources/StreamChat/ChatClient.swift	96.58% <100.00%> (ø)
.../CurrentUserController/CurrentUserController.swift	94.61% <100.00%> (+0.40%)	⬆️
...ocketClient/Engine/StarscreamWebSocketEngine.swift	0.00% <0.00%> (-30.96%)	⬇️
Sources/StreamChat/Database/DTOs/MessageDTO.swift	94.39% <0.00%> (-1.05%)	⬇️
.../Utils/InternetConnection/InternetConnection.swift	54.05% <0.00%> (-0.91%)	⬇️
...ources/StreamChat/Database/DatabaseContainer.swift	96.12% <0.00%> (-0.78%)	⬇️
Sources/StreamChat/Models/Message.swift	88.63% <0.00%> (+0.26%)	⬆️

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