Treat `@PostConstruct` methods as constructors for `UWF_FIELD_NOT_INITIALIZED_IN_CONSTRUCTOR`

[Falko Modler]

Very similar to #453.

As of SB 4.8.3, UWF_FIELD_NOT_INITIALIZED_IN_CONSTRUCTOR is reported for the following class:

// CDI bean
@ApplicationScoped
puplic class Foo {
    private Object bar;

    @PostConstruct
    void init() {
        bar = new Object();
    }

    public String doSomethingWithBar() {
        return bar.toString();
    }
}

This will never be a problem during runtime (only maybe in simple tests that don't use CDI, but you'll notice soon enough).

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