[NEW] Support uploading in new composer

[cardoso]

@RocketChat/ios

[codecov]

Codecov Report

Merging #2233 into feature/integrate-rc-view-controller will decrease coverage by 0.24%.
The diff coverage is 0%.

@@                           Coverage Diff                            @@
##           feature/integrate-rc-view-controller    #2233      +/-   ##
========================================================================
- Coverage                                 27.55%   27.31%   -0.25%     
========================================================================
  Files                                       409      411       +2     
  Lines                                     15338    15477     +139     
========================================================================
  Hits                                       4227     4227              
- Misses                                    11111    11250     +139

Impacted Files	Coverage Δ
...ontrollers/Chat/MessagesViewControllerBanner.swift	0% <0%> (ø)
.../Chat/MessagesViewControllerComposerDelegate.swift	0% <0%> (ø)	⬆️
...rollers/Chat/MessagesViewControllerUploading.swift	0% <0%> (ø)

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[rafaelks]

Nice!!! :-)