Identical Routes are not considered equal: AsyncPredicate does not override equals()

Two logically equal Routes are not programmatically equal since Route's equals() compares predicates, and the AsyncPredicate class does not override equals() (hence you get a simple reference comparison). Here's a test that reproduces the issue:

class RouteEqualityTest {

    @Test
    void testTwoIdenticalRouteAreEqual() {
        assertThat(getRouteBuilderStub().build()).isEqualTo(getRouteBuilderStub().build());
    }

    private Route.AsyncBuilder getRouteBuilderStub() {
        return Route.async()
                .id("123")
                .uri("https://example.com")
                .predicate(exchange -> exchange.getRequest()
                        .getPath()
                        .value()
                        .equals("/test-path"));
    }
}

Read Route.equals and AsyncPredicate first, then run the supplied RouteEqualityTest reproduction using Route.async(). Done means independently built routes with identical configuration compare equal, with regression coverage for predicate comparison.