Plugins: missing argument for filter:activity-pub.activity.context.build.result

[JohnXLivingston]

Describe the problem to be solved

The filter:activity-pub.activity.context.build.result hook is called for all kind of ActivityPub objects (video, channels, ...).

But there is no argument to tell the plugin on which context we are building the AP context.

Describe the solution you would like

This hook should receive an additional parameter, telling on which context we are.

Or, another solution: add a filter:activity-pub.video.context.build.result (as it is related to filter:activity-pub.video.json-ld.build.result which is only called for video objects).