Thai Shrimp Soup With Rice Noodles

Name: Thai Shrimp Soup With Rice Noodles
Ingredients: 8 ounces dried rice noodles; ½ teaspoon toasted sesame oil; 1½ pounds large shrimp (raw, shell-on); 2 Thai chiles or some other small, hot chiles; 1 garlic clove, smashed; 8 cups low-sodium chicken broth; 2 teaspoons Asian fish sauce; ¾ teaspoon kosher salt; ¼ teaspoon black pepper; 4 scallions, sliced (¼ cup), divided; ¾ cup cilantro leaves, divided; 3 cups mung bean sprouts; ½ cup salted roasted peanuts, chopped; Lime wedges, for serving