[FIX] Freezing video thumb generation & race condition on data

[rafaelks]

@RocketChat/ios

• Resolves race condition on accessing the data objects;
• Resolves freezing on video thumb generation;
• Make page size be always 30;

[filipealva]

👍

[cardoso]

✌️

[codecov]

Codecov Report

Merging #2309 into develop will increase coverage by 0.16%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #2309      +/-   ##
===========================================
+ Coverage    26.11%   26.27%   +0.16%     
===========================================
  Files          436      436              
  Lines        15918    15919       +1     
===========================================
+ Hits          4157     4183      +26     
+ Misses       11761    11736      -25

Impacted Files	Coverage Δ
...t.Chat/Views/Cells/Chat/ChatMessageVideoView.swift	0% <0%> (ø)	⬆️
...t.Chat/Views/Subscriptions/FileTableViewCell.swift	0% <0%> (ø)	⬆️
...ews/Chat/New Chat/Cells/BaseVideoMessageCell.swift	0% <0%> (ø)	⬆️
...cket.Chat/Controllers/Chat/MessagesViewModel.swift	28.9% <0%> (-0.46%)	⬇️
...ontrollers/Base/Main/MainSplitViewController.swift	45% <0%> (-7.5%)	⬇️
...Chat/Controllers/Chat/MessagesViewController.swift	33.51% <0%> (-3.79%)	⬇️
Rocket.Chat/Managers/AppManager.swift	47.26% <0%> (+4.79%)	⬆️
Rocket.Chat/Managers/PushManager.swift	34.48% <0%> (+10.34%)	⬆️
...Chat/Models/Subscription/SubscriptionQueries.swift	100% <0%> (+30%)	⬆️
...anagers/Model/AuthManager/AuthManagerRecover.swift	96.96% <0%> (+60.6%)	⬆️

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