[IMPROVEMENT] Performance improvements on the list and a pack with other improvements

[rafaelks]

@RocketChat/ios

• Cache the markdown processed message on the background to be ready when the cell is being presented the first time;
• Removed unnecessary steps from CocoaPods (there was some duplicated calls on the Build Steps);
• Improved the usage of delegates on the cells to follow a protocol;

[codecov]

Codecov Report

Merging #2291 into develop will increase coverage by 0.05%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop    #2291      +/-   ##
===========================================
+ Coverage    25.96%   26.02%   +0.05%     
===========================================
  Files          432      432              
  Lines        15857    15836      -21     
===========================================
+ Hits          4118     4121       +3     
+ Misses       11739    11715      -24

Impacted Files	Coverage Δ
...t/Views/Chat/New Chat/Cells/ImageMessageCell.swift	0% <ø> (ø)	⬆️
...cket.Chat/Views/Chat/New Chat/Cells/FileCell.swift	0% <ø> (ø)	⬆️
...t/Views/Chat/New Chat/Cells/BasicMessageCell.swift	0% <ø> (ø)	⬆️
...Views/Chat/New Chat/Cells/MessageActionsCell.swift	0% <ø> (ø)	⬆️
...ket.Chat/Views/Chat/New Chat/Cells/QuoteCell.swift	0% <ø> (ø)	⬆️
...Views/Chat/New Chat/Cells/TextAttachmentCell.swift	0% <ø> (ø)	⬆️
...at/Views/Chat/New Chat/Cells/FileMessageCell.swift	0% <ø> (ø)	⬆️
...hat/Views/Chat/New Chat/Cells/MessageURLCell.swift	0% <ø> (ø)	⬆️
Rocket.Chat/Managers/MessageTextCacheManager.swift	83.33% <ø> (ø)	⬆️
...ket.Chat/Views/Chat/New Chat/Cells/ImageCell.swift	0% <ø> (ø)	⬆️
... and 6 more

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[cardoso]

👍

[filipealva]

Looking goood 💯