[CIS-858] Always refetch queries when reconnected

[VojtaStavik]

Turn our the /sync endpoint returns only the events for the channels specified in the request. This means if the current user is added to a new channel while offline, the new channel won't appear in the channel list.

• the first commit is just renaming, clean-up, and reorganizing of existing api
• the second one is the actual functionality

[codecov-commenter]

Codecov Report

Merging #1092 (2a9282e) into main (aa9f78d) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #1092      +/-   ##
==========================================
- Coverage   91.68%   91.67%   -0.02%     
==========================================
  Files         215      216       +1     
  Lines        9121     9153      +32     
==========================================
+ Hits         8363     8391      +28     
- Misses        758      762       +4     

Flag	Coverage Δ
llc-tests	91.51% <80.00%> (-0.02%)	⬇️
llc-tests-ios12	88.38% <80.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...at/Workers/Background/MissingEventsPublisher.swift	89.02% <75.00%> (-5.18%)	⬇️
...es/StreamChat/Workers/DatabaseCleanupUpdater.swift	94.64% <100.00%> (ø)
Sources/StreamChat/Utils/Logger/Logger.swift	79.74% <0.00%> (-2.54%)	⬇️
...urces/StreamChat/Database/DTOs/AttachmentDTO.swift	83.97% <0.00%> (-1.90%)	⬇️
Sources/StreamChat/Config/ChatClientConfig.swift	100.00% <0.00%> (ø)
Sources/StreamChat/Utils/MultipartFormData.swift	100.00% <0.00%> (ø)
...Chat/Models/Attachments/AnyAttachmentPayload.swift	100.00% <0.00%> (ø)
...hat/Models/Attachments/ChatMessageAttachment.swift	96.42% <0.00%> (ø)
...Models/Attachments/ChatMessageFileAttachment.swift	94.44% <0.00%> (ø)
...odels/Attachments/ChatMessageGiphyAttachment.swift	70.58% <0.00%> (ø)
... and 6 more

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[b-onc]