DM: Add an actor.wait() action

Update 2021.12.09

This issue was voted on in final project meeting for further analysis in final review period (2022-Q1)

There is an open MR with a proposal !300

Original post

Need "Wait" Action added to Action Domain Model

Main Use

v1.Wait() with:
   until(@event1)

Need this for users that use "strict composition" rules that completely fill the parallel.

This allows the user to fill a serial composition for lateral behavior.

Example1

    do parallel:
        serial:   #LONGITUDINAL BEHAVIOR for v1
            v1_init_drive_01: v1.Drive() with:
                along(route: r1)
                speed(speed: 50 kph)
                at(at: start)
                until(@Observation_Complete)
        serial:    #LATERAL BEHAVIOR for v1
            v1_wait1_01: v1.Wait() with:
                until(@event1)
            v1_changelane_01: v1.ChangeLane() with:
                ...
            v1_wait2_01: v1.Wait() with:
                until(@event2)

Example2

    do parallel:
        v1_init_drive_01: v1.Drive() with:
            along(route: r1)
            speed(speed: 50 kph)
            at(at: start)
            until(@Observation_Complete)
        serial:    #LATERAL BEHAVIOR for v1
            v1_wait1_01: v1.Wait() with: 
                until(rise(a > b))
            v1_changelane_01: v1.ChangeLane() with:
                ...
            v1_wait2_01: v1.Wait() with:
                until(@event2)            

Related To Rise / Fail Capability Need

https://code.asam.net/simulation/standard/openscenario-2.0/-/issues/26

Unsure About How Rise and Fall Should be Used

rise(a > b)
fall(b < a)