Make fuzzer use static methods to create arbitrary objects

[IlyaMuravjov]

Description

Now fuzzer can use both static methods and constructors to create instances of arbitrary types.

Fixes #2437

How to test

Automated tests

The proposed changes are verified with tests:
utbot-java-fuzzing/src/test/kotlin/org/utbot/fuzzing/JavaFuzzingTest.kt

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.

[Markoutte]

Could you, please, check what will happen if generics are used? Something like:

class A<T> {
    public static A<String> getStringTyped() { return new A<>("Test") }
    private A(T value) {};
}

...

public void testedMethod(A<Integer> expected) { ... }

[IlyaMuravjov]

It will erroneously use getStringTyped() to create A<Integer>. I was assuming that java fuzzer doesn't attempt to fully respect generic types here, since similar issue could have been reproduced even before this pull request:

interface A<T> {
    T get();
}

class AImpl implements A<String> {
    @Override
    public String get() {
        return "Test";
    } 
}

...

public void testedMethod(A<Integer> expected) { ... }

[Markoutte]

Fair enough, I tried to fix it with #2451. Please, review it when it is possible. I think same can be done for this PR when 2451 is merged.