Swordfish Steaks with Olive Gremolata

Name: Swordfish Steaks with Olive Gremolata
Ingredients: 7 tablespoons olive oil, divided, plus more for grill; 3/4 cup coarsely torn fresh breadcrumbs; Kosher salt, freshly ground pepper; 2 tablespoons chopped fresh parsley; 2 tablespoons coarsely chopped green olives (such as Castelvetrano); 1 tablespoon coarsely chopped golden raisins; 1 teaspoon finely grated lemon zest; 2 (8–10-ounce) swordfish steaks (1–1 1/4 thick); Lemon wedges (for serving)