Add hook for 'Social Activity Viewer' to have possibility alter query in ActivityFilterPersonalisedHomepage filter

Problem/Motivation

ActivityFilterPersonalzedHomepage plugin filters the activity on the stream on the home page. However, it filters by the three types node, comment, and post. In case we want to display activities that are related to a custom entity, we get a bug - these activities are simply not displayed on the stream for verified users.

Proposed resolution

Add a hook this plugin, to have the possibility to alter the query of this filter, and also specifically alter the condition in one of the OR group conditions