Chore: Deprecate Dimensions

[diegolmello]

Proposed changes

We’ve been using our own Dimensions context on the root of the app.

Instead, we need to migrate to RN’s useWindowDimensions moving the whole logic to a self contained hook and decreasing complexity on app/index and app/share.

It’s going to take some time until we can finish this, because some components aren’t using hooks yet and they rely on our current logic, so let’s start using useWindowDimensions in baby steps.

On this PR, we're deprecating everything related to the current implementation.

Issue(s)

How to test or reproduce

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

NATIVE-117