fix: improve disassemble view for java-input

jadx-plugins/jadx-plugins-api/src/main/java/jadx/api/plugins/input/data/impl/CallSite.java

@@ -33,4 +33,9 @@ public class CallSite implements ICallSite {
 	public List<EncodedValue> getValues() {
 		return values;
 	}
+
+	@Override
+	public String toString() {
+		return "CallSite{" + values + '}';
+	}
 }

jadx-plugins/jadx-plugins-api/src/main/java/jadx/api/plugins/input/insns/InsnData.java

@@ -17,6 +17,8 @@ public interface InsnData {
 
 	Opcode getOpcode();
 
+	String getOpcodeMnemonic();
+
 	byte[] getByteCode();
 
 	InsnIndexType getIndexType();