Conversion computation

[akalfas]

To the date, the conversion attribute is set on the bundle by looking at the events from the bundle https://github.com/adobe/helix-website/blob/main/tools/rum/cruncher.js#L56 - extending the approach would be to allow some degree of configurability on what computation is performed.

Couple of ways:

• allow different checkpoints - i.e. conversion happened if the media was viewed
• extend the computation to the other attributes as well - i.e. conversion happened if there was a click on '/buy'
• extend the computation on multiple events in the bundle - i.e. two clicks happened