Extend targets at the server side

**Required Feature**

- Support target specifying outside the AJAX triggering html element.

Currently we are using events to deal with this scenario, but that results in a number of GETs that can be avoided if we use the reuturned HTMX to updated the HAS-TO-BE-UPDATED elements.

**Scenario**
User: connect to the server to login
System: returns an HTML view rendered. (see the attached file)
User:enters some text on the first firstName
System:Automatically updates the other fields based on the entered value.

**Current Approach**
when the user enters some text in the firstName name text field, the element sends a post request to the server. The server then processes the request and generates the html response. in the header of the response, the event names respective to each to-be-updated element. HTMX sends GETs request based on the configuration.

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**The context**

We are working on a components kit in java.