Create a Linkedin config and data provider.

Problem/Motivation

I needed to integrate a linkedin inegration to import post from linkedin.

Proposed resolution

I have follow the way of module, and create a dataprovider, a queueworker and a node processor.
I have adding a new route to allow user to e abble to autentifiate to linkedin web site, and so authorize the web site to get posts.

Remaining tasks

User interface changes

A new fieldset has been create to adding config form of linkedin.

API changes

Data model changes