Use scoped emitter for page view stats

[brendean]

Type of issue

Feature request

Description

Instead of using the globally scoped event emitter using an emitter scoped to the request should allow us to log events with context specific details (actual path and headers from the request). This would also require the context object being passed into the emit call.

Current behavior

pageview:server is emitted on the global event bus and does not include context.

Expected behavior

pageview:server is emitted on a event bus scoped to an individual request and includes the context.