Add the locale field and an extra Bundle to the InlineSuggestionsRequest.

* The extra can be used to indicate the UI rendering library version, as well as anything else we may need after API freeze
* Also make the style in InlinePresentaionSpec publically accessible

Test: build
Bug: 146454892

Change-Id: Iaaf66c2dcffdef3ef8e91c347774afa3aa6176f9