feat: adding init metadrive interface to Scenic

src/scenic/simulators/metadrive/__init__.py

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+from .simulator import MetaDriveSimulator

src/scenic/simulators/metadrive/model.scenic

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+from scenic.simulators.newtonian.simulator import MetaDriveSimulator 
+simulator MetaDriveSimulator()

src/scenic/simulators/metadrive/simulator.py

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+from scenic.core.simulators import (
+    Simulation,
+    SimulationCreationError,
+    Simulator,
+    SimulatorInterfaceWarning,
+)
+
+from metadrive.envs import BaseEnv
+import logging
+
+class MetaDriveSimulator(Simulator):
+    def __init__(self):
+        self.client = BaseEnv(dict(use_render=False, # if you have a screen and OpenGL suppor, you can set use_render=True to use 3D rendering  
+                manual_control=False, # we usually manually control the car to test environment
+                log_level=logging.CRITICAL)) # suppress logging message
+        super().__init__()
+
+    def createSimulation(self, scene, **kwargs):
+        simulation = MetaDriveSimulation(self, scene, self.client, **kwargs)
+        self.client.top_down_renderer.generate_gif()
+        return 
+
+    def destroy(self):
+        self.client.close()
+        super().destroy()
+
+class MetaDriveSimulation(Simulation):
+    def __init__(self, simulator, scene, client, **kwargs):
+        self.simulator = simulator
+        self.client = client
+        super().__init__(scene, **kwargs)
+
+    def setup(self):
+        super().setup()
+
+    def step(self):
+        self.client.step(self.client.action_space.sample())
+
+