tests/motors/drivebase: Add s-curve test.

Drive straight, curve right, curve left, and straight again, all without stopping.

tests/motors/drivebase_curve_segments.py

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+from pybricks.pupdevices import Motor
+from pybricks.tools import wait
+from pybricks.parameters import Port, Direction, Stop
+from pybricks.robotics import DriveBase
+from pybricks import version
+
+print(version)
+
+# Initialize default "Driving Base" with medium motors and wheels.
+left_motor = Motor(Port.C, Direction.COUNTERCLOCKWISE)
+right_motor = Motor(Port.D)
+drive_base = DriveBase(left_motor, right_motor, wheel_diameter=56, axle_track=112)
+
+# Allocate logs for motors and controller signals.
+DURATION = 20000
+DIV = 4
+left_motor.log.start(DURATION, DIV)
+right_motor.log.start(DURATION, DIV)
+drive_base.distance_control.log.start(DURATION, DIV)
+drive_base.heading_control.log.start(DURATION, DIV)
+
+# Drive straight, curve right, curve left, then straight, without stopping.
+drive_base.straight(500, Stop.NONE)
+drive_base.curve(200, 90, Stop.NONE)
+drive_base.curve(200, -90, Stop.NONE)
+drive_base.straight(500)
+
+# Wait so we can also log hold capability, then turn off the motor completely.
+wait(100)
+drive_base.stop()
+
+# Transfer data logs.
+print("Transferring data...")
+left_motor.log.save("servo_left.txt")
+right_motor.log.save("servo_right.txt")
+drive_base.distance_control.log.save("control_distance.txt")
+drive_base.heading_control.log.save("control_heading.txt")
+print("Done")