BHV-14938: Added text directionality detection to placeholder and value properties

`placeholder` and `value` are used by InputHeader. Enabling detection on these properties means that text, when entered into an InputHeader can dynamically flip as needed by the input'd text.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
`value` should be added here too, yes. But it wouldn't mean that we can remove the call during `rendered`, since the reason it's in rendered is different from simply running. When `valueChanged` is simply in `create` (or called by `placeholderChanged` which is in `create`), the directionality is not correctly applied. It _must_ be applied later. I'll add the value check here now.