remove container ref from signal

[wmertens]

What is it about?

memory optimization

What's the motivation for this proposal?

Each signal stores the container so that effects can be scheduled. But the scheduling is only needed for vnode subscribers, so then the container can be retrieved by walking up the vnode tree.

The container will also often already be in the context.

Proposed Solution / Feature

Therefore, we don't need to store the container on the signal, and in doing so each signal is 8 bytes smaller. That matters when you have large DOM structures.

Links / References

No response