Provide better java interop

[Sineaggi]

Expected Behavior

The ability to call mockk functions from java, without much hassle.

For example, something like the following

import org.junit.jupiter.api.Test;

import static io.mockk.MockKKt.*;

class JavaTest {
    @Test
    public void test() {
        var car = mockk(Car.class);
        every(scope -> car.drive(Direction.NORTH)).returns(Outcome.OK);
        car.drive(Direction.NORTH); // returns OK
        verify(scope -> car.drive(Direction.NORTH));
        confirmVerified(car);
    }
}

Current Behavior

Can't call entrypoints (mockk, spyk) due to functions being marked as inline.

Thoughts on improving java integration

By creating additional non-inlined overloads, annotated with @JvmOverloads, it should be possible to provide an ok java experience.

I've opened a draft PR #1207 to show what the overloads would look like to provide a better java interop.

[Raibaz]

Thanks for looking into this!

The non-inlined overloads look good to me.

Feel free to finish the PR and I'll be super glad to review it :)