Fix mark read issues

[tbarbugli]

🎯 Goal

• Ensure channel is marked as read when a message is added to the list and its visible (before it would only happen when the user opens the channel or when the list was scrolled)
• Avoid calling markRead endpoint multiple times (before scrolling would cause tens of calls to markRead)

🛠 Implementation

• Moved some db logic from middleware to database code
• The channel updater now updates the DB when mark read is called (this is to avoid races)

🧪 Testing

• Manual testing

🎨 Changes

Add relevant screenshots or videos showcasing the changes.

☑️ Checklist

• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)

[tbarbugli]

This PR should resolve #1558

[Stream-iOS-Bot]

	6 Errors
🚫	Please start subject with capital letter. a80ac91
🚫	Please start subject with capital letter. c61ec5b
🚫	Please start subject with capital letter. 0652483
🚫	Please use more than one word. 1063aa7
🚫	Please start subject with capital letter. 5697fe1
🚫	Please start subject with capital letter. 8e994a8

Generated by 🚫 Danger

[nuno-vieira]

LGTM! ✅ Just added 2 small nit's, feel free to fix them 👍

[codecov]

Codecov Report

Merging #1569 (c63ad90) into main (ba3adea) will decrease coverage by 0.05%.
The diff coverage is 65.71%.

@@            Coverage Diff             @@
##             main    #1569      +/-   ##
==========================================
- Coverage   85.24%   85.18%   -0.06%     
==========================================
  Files         232      232              
  Lines       10773    10786      +13     
==========================================
+ Hits         9183     9188       +5     
- Misses       1590     1598       +8     

Flag	Coverage Δ
llc-tests	85.18% <65.71%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
Sources/StreamChat/Database/DatabaseSession.swift	89.79% <ø> (ø)
...trollers/ChannelController/ChannelController.swift	86.70% <23.07%> (-1.53%)	⬇️
...rces/StreamChat/Database/DTOs/ChannelReadDTO.swift	96.72% <88.23%> (-3.28%)	⬇️
...ventMiddlewares/ChannelReadUpdaterMiddleware.swift	91.30% <100.00%> (+3.80%)	⬆️
Sources/StreamChat/Workers/ChannelUpdater.swift	87.07% <100.00%> (+0.17%)	⬆️

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