feat: add `is_lock` and `is_allow` methods to `RotationConstraints`

[LiamGallagher737]

For the record, would you mind share why you needed this?

When doing the following in update the entity wouldn't move

if input.handbrake {
    *rotation_constraints = RotationConstraints::lock();
} else {
    *rotation_constraints = RotationConstraints::allow();
}

But this would

if input.handbrake && rotation_constraints.allow_x && rotation_constraints.allow_y && rotation_constraints.allow_z {
    *rotation_constraints = RotationConstraints::lock();
} else if !input.handbrake && !rotation_constraints.allow_x && !rotation_constraints.allow_y && !rotation_constraints.allow_z {
    *rotation_constraints = RotationConstraints::lock();
}

[github-actions[bot]]

:tada: This issue has been resolved in version 4.0.0-alpha.2 :tada:

[github-actions[bot]]

:tada: This issue has been resolved in version 4.0.0 :tada: