py: Implement floating point power binop.

py/objfloat.c

@@ -124,6 +124,8 @@ check_zero_division:
                 nlr_jump(mp_obj_new_exception_msg(&mp_type_ZeroDivisionError, "float division by zero"));
             }
             break;
+        case MP_BINARY_OP_POWER:
+        case MP_BINARY_OP_INPLACE_POWER: lhs_val = MICROPY_FLOAT_C_FUN(pow)(lhs_val, rhs_val); break;
         case MP_BINARY_OP_LESS: return MP_BOOL(lhs_val < rhs_val);
         case MP_BINARY_OP_MORE: return MP_BOOL(lhs_val > rhs_val);
         case MP_BINARY_OP_LESS_EQUAL: return MP_BOOL(lhs_val <= rhs_val);