[Feature] WithLink support

[nuskey8]

Since AddTo is only for OnDestory, it cannot handle complex requirements; a feature like DOTween's SetLink may be needed.

[nuskey8]

The proposed API is as follows: add a WithLink method to the Builder and specify the behavior with an enum called LinkBehaviour. This internally uses the MotionHandleLinker component.

LMotion.Create(0f, 1f, 10f)
    .WithLink(gameObject, LinkBehaviour.CancelOnDisable)
    .BindToPositionX(transform);

[nuskey8]

The following issues can be considered during implementation:

Pause/Resume Motion

DOTween's LinkBehaviour has an option to pause/resume. This can also be done with LitMotion, but pause/resume in LitMotion is represented by PlaybackSpeed. Naming something like "PauseOn-" doesn't seem to fit this library. (Also, the restart function is not implemented in the first place, so it is impossible.)

WithLink after creation

If you add WithLink to the builder, configuration after creation is not possible. Maybe this should be added to MotionHandle instead of builder.

[nuskey8]

Another API idea is to add a LinkBehaviour argument to AddTo. I think this is better from a practical standpoint.

var handle = LMotion.Create(0f, 1f, 10f).RunWithoutBinding();
handle.AddTo(gameObject, LinkBehaviour.CancelOnDisable);

[nuskey8]

#106 This PR adds LinkBehaviour options to AddTo. Currently there are only three types, but this seems sufficient for the time being.

[akeit0]

Isn't ’Discussions’ the best place to talk about this?

[nuskey8]

I have moved this issue to discussions.