When enum is not accessible, it shouldn't be created by fuzzer (#1660)

[Markoutte]

Description

Before there's no accessibility check for enum types.

Fixes #1660

How to test

Automated tests

utbot-fuzzer/src/test/kotlin/org/utbot/fuzzing/JavaFuzzingTest.kt

Manual tests

Run this example:

public class PrivateTest {
    public void foo(Call call) {

    }

    private enum Call {
        ONE;
    }
}

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.