[WIP] [NEW] Project 08 - Adding Reactions VoiceOver accessible

[rudrankriyam]

@RocketChat/ios

• [x] To open the Add Reactions View, double tap on the name and hold it for a second. (The Voice Over way of long press)
• [x] Categories.custom / categories.recent and all the other categories need to be assigned an accessibility label, which are defined in the RCEmojiKit.strings. Currently, they are described in VoiceOver as “Tab x of 10” button.
• [x] The skinTone button needs to be assigned accessibilityLabel = “Change Skin Tone”
• [x] Added current skin tone for the skinTone button
• [x] The custom emojis are not tapped as single elements, but as a whole view.
• [x] Add the labels for each custom emoji.
• [x] Fixed custom emojis bug.
• [x] Header accessibility for emoji category.

[codecov[bot]]

Codecov Report

Merging #2746 into develop will decrease coverage by 0.01%. The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #2746      +/-   ##
===========================================
- Coverage     46.1%   46.09%   -0.02%     
===========================================
  Files          626      626              
  Lines        28938    28946       +8     
===========================================
  Hits         13343    13343              
- Misses       15595    15603       +8

Impacted Files	Coverage Δ
...nal/RCEmojiKit/Views/EmojiPicker/EmojiPicker.swift	0% <0%> (ø)	:arrow_up:
...it/Views/EmojiPicker/EmojiCollectionViewCell.swift	0% <0%> (ø)	:arrow_up:

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[rudrankriyam]

Thank you for your review @Sameesunkaria !

And thanks for the skin tone names! I will edit the skinTone array from
let skinTones: [(name: String?, color: UIColor)] to let skinTones: [(name: String?, color: UIColor, accessibilityName: String?)]

For the default skinTone, I don't know why nil was used for the name. I will edit the accessibilityName to default.