feat(hogql): add funnel hogql actors

[thmsobrmlr]

Problem

Funnels need to be converted to HogQL (see the funnels section in PostHog/meta#130).

Changes

Adds frontend side handling of funnel actors and a HogQL version of actors for the regular funnel. The proposed schema for the actors nodes is now as following:

select * from (
    <ActorsQuery select={['properties.name']}>
        <FunnelsActorsQuery funnelStep={2}>
            <FunnelsQuery
                dateRange={<DateRange date_from='2020-01-01' date_to='2020-01-19' />}
                series={[<EventsNode event='$pageview' />, <EventsNode event='$pageview' />]}
            />
        </FunnelsActorsQuery>
    </ActorsQuery>
)

I kept the filter names similar to the existing ones e.g. funnelStep, but they could be shortened to e.g. step or something more expressive like actorsStep.

Follow-ups

• Include recordings feat(hogql): implement include_recordings for funnel actors #20503
• Actors for other funnel classes feat(hogql): add remaining funnel actors #20496

How did you test this code?

Converted existing tests

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[mariusandra]

Looks good to me! 👍

[webjunkie]

I'm actually not sure if this is ever False. It wasn't when I worked on it on paths. So we might just optimize this away and always return them.

[thmsobrmlr]

Thanks for the hint, I'll double check this. I think for funnels this might be false for correlation queries or correlation actor queries. Might make sense to remove it from the schema though.