Class namings

[fmatak]

io.github.stefanbratanov.jvm.openai.Thread class, sharing the same name java.lang.Thread, which is imported by default, causes some issues when using the library. Each time prefixing it with the full package name become a bit tedious. Maybe changing the class names that could potentially cause conflicts could help?

This is also applicable for some other classes like File, Constants etc. But since these classes are not included automatically, it is not that big problem.

thank you