Show _value_ of conversion in funnel results

[Twixes]

Is your feature request related to a problem?

It's common to set up a funnel ending with some sort of purchase or payment event. In these cases it could also be useful to view the total, average or median value of those conversion events, as defined by a chosen property (e.g. amount_usd).

Describe the solution you'd like

We can add an optional "Value property" setting to funnel steps, which would then be aggregated in the results.

Describe alternatives you've considered

Currently a good workaround is creating a cohort of people who have the events prerequisite for conversion, and making a Trends chart filtered by that cohort.

Additional context

This was requested by a customer.

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