Sync the serialization and deserialisation between render and hydration

[sansyrox]

Right now, the signals are maintaining a reverse map, which is a very hacky solution. We need to serialize the tree map on the hydration end and then move to the front.

Maybe we will need the streaming to work for this.

But, for the initial part, we can transfer it across the files.

[sansyrox]

We will be setting a window variable in every web page