[WIP] [NEW] Project 07 - Uploading files VoiceOver accessible

[rudrankriyam]

@RocketChat/ios

• [x] Composer Button is described in VoiceOver as a “Button” and should be accessibilityLabel = “Upload Media” and accessibilityHint = “Take a photo, record video, choose from library, attach files or draw something”

• [x] The name and the description of the file to be uploaded must have an accessibility trait of text field.

• [x] While playing the video using MobilePlayer, the time duration and the track position is not accessible.

• [x] The images are described in VoiceOver as “Button” which need to have an accessibility label assigned to it, with the title of the image.