chore: a11y focus change on iOS

[OtavioStasiak]

Proposed changes

We were facing some issues with a11y focus on iOS. The problematic case involved the FormTextInput component with secureTextEntry enabled, as VoiceOver was reading the entire component instead of focusing first on the input and then on the "Show Password" button.

To fix this, I created a native module that receives an array of organized React tags for the elements and updates the accessibilityElements property of the parent view.

Issue(s)

https://rocketchat.atlassian.net/browse/MA-200

How to test or reproduce

• Open the app;
• Navigate to loginView;
• Turn on the VoiceOver;
• Try focusing on the password input, then move to the next element;
• it should be the "Show Password" button;

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments