Create API to set page_id

[cedricziel]

Description

In order to recognize components in my application, I want to be able to call a public API that sets the page_id meta.

The page_url meta is automatically used from the actual hash and the id is calculated in the backend if not set - making it set-able improves the user-experience when having multiple views in my app.

Proposed solution

Create a public setPage(id: ?string) method that allows to set and unset the page_id meta.

Context