Allow to override waiting strategy and waiting time in Tests

[bitxon]

Motivation

default waiting strategy needs to be configured in constructor.
method configure() is being executed right before container starts, so if we set waiting strategy here we will override any user specified waiters

Before fix

    public WireMockContainer wiremockServer = new WireMockContainer("2.35.0")
            .waitingFor(Wait.defaultWaitStrategy()) // ignored due to bug
            .withStartupTimeout(Duration.ofSeconds(11)) // ignored due to bug

After fix

   public WireMockContainer wiremockServer = new WireMockContainer("2.35.0")
            .waitingFor(Wait.defaultWaitStrategy()) // developer able to override strategy
            .withStartupTimeout(Duration.ofSeconds(11)) // developer able to override timeout

[oleg-nenashev]

Agreed, thanks for the patch!