[IMPROVEMENT][RCVC] HintsView layout adjustments & user priority

[cardoso]

@RocketChat/ios

• Users need to be the last 5 to send messages in the current channel
• Darkened background
• Align avatars with 'Suggestions' & cell separator with usernames
• remove own user from list

Closes #2347

[codecov]

Codecov Report

Merging #2367 into develop will increase coverage by 0.05%.
The diff coverage is 39.13%.

@@             Coverage Diff             @@
##           develop    #2367      +/-   ##
===========================================
+ Coverage     25.8%   25.85%   +0.05%     
===========================================
  Files          443      444       +1     
  Lines        16632    16696      +64     
===========================================
+ Hits          4292     4317      +25     
- Misses       12340    12379      +39

Impacted Files	Coverage Δ
.../Chat/MessagesViewControllerComposerDelegate.swift	0% <ø> (ø)	⬆️
...ons/UIViewController/UIViewControllerDimming.swift	0% <0%> (ø)
...t/Controllers/Chat/MessagesComposerViewModel.swift	0% <0%> (ø)	⬆️
...Chat/Controllers/Chat/MessagesViewController.swift	42.23% <66.66%> (+0.29%)	⬆️
Rocket.Chat/Extensions/Models/UserExtensions.swift	69.69% <66.66%> (-2.72%)	⬇️
...cket.Chat/Controllers/Chat/MessagesViewModel.swift	35.22% <75%> (+7.52%)	⬆️

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[filipealva]

awesome 💯