Fuzzer generates values even when class is private #1635

[Markoutte]

Description

Fixes an issue when some declared type is private, but has public constructor, fields or setter/getter. Fuzzer cannot create such values without reflections therefore it is prohibited to produce them.

Fixes #1635

Type of Change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Regression and integration tests

Added new test fuzzing should not generate values of private classes into JavaFuzzingTest.kt

Manual Scenario

Try to reproduce issue's scenario. It should not create any test.

Checklist (remove irrelevant options):

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• New documentation is provided or existed one is altered
• No new warnings
• New tests have been added
• All tests pass locally with my changes