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.
• You have signed the CLA.
• 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?

Using text-overflow or white-space with TextField had no effect on the appearance of the text input.

What is the new behavior?

Users can now use:

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

Or the tailwind equivalent truncate utility to properly add ending ellipsis to a long input field.