feat(transitions): support zIndex on ios shared elements + support page props on android

[NathanWalker]

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.
• Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/tools/notes/WritingUnitTests.md.

What is the current behavior?

Visual ordering of shared elements would occur at random often. Also Android pageEnd props would not be considered.

What is the new behavior?

This allows zIndex to be set if a specified visual stacking order is preferred during the transition. This also allows Android pageEnd props to be considered.

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