SRG SSR hidden and page view tracking support

[defagos]

As an app developer integrating Pillarbox I want to be able to track page views according to the SRG SSR standards. I also want to be able to track various arbitrary events.

Acceptance criteria

• Manual page view tracking is possible.
• Hidden tracking is possible.

Tasks

• [x] Implement page view analytics for comScore.
• [x] Implement page view analytics for Commanders Act.
• [x] Implement hidden event analytics for Commanders Act.
• [x] Decide what must happen if an empty page title is provided.
• [x] Discuss if app overlap measurements are still needed and create a story if the answer is yes.

[defagos]

App overlap measurements are not needed anymore.

[defagos]

For comScore and according to the implementation guide we currently only fill ns_category for page view events. Whether other fields are required needs clarification, see https://github.com/SRGSSR/pillarbox-documentation/issues/25.