Add java object transformer

[snuyanzin]

Another transformer which could fill java objects
e.g. this will generate a collection of Person objects according to schema

JavaObjectTransformer jTransformer = new JavaObjectTransformer();
        Schema<Object, ?> schema = Schema.of(
            field("firstName", () -> faker.name().firstName()),
            field("lastName", () -> faker.name().lastName()),
            field("birthDate", () -> faker.date().birthday()),
            field("id", () -> faker.number().positive()));

        Collection<Person> persons = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            persons.add(jTransformer.apply(Person.class, schema));
        }

full example is here https://github.com/datafaker-net/datafaker/pull/513/files#diff-b7465230f153bf0f00c1788b28aeb4a239eac7c4438819f5bf6134943b993177R13-R42

cc @bodiam since you were looking for something like that afair

[bodiam]

Nice. I'm still a bit more a fan of what EasyRandom does, eg if you have a structure like this:

data class Person(val addresses: List<Address>)

data class Address(val street: String, val city: String, val country: String)    

That we can generate something by doing:

val person = faker.populate(Person())

[bodiam]

@snuyanzin what do you want to do with this PR?

[snuyanzin]

let's merge it