refactor(core): WIP - partial hydration prototype - #56311

this adds support in the defer block ast to parse hydrate statements for partial hydration.

This adds the set of instructions to support usage of hydrate in defer blocks

The hydration test file is giant. This breaks it up into full app and partial files.

This separates out the full app hydration and partial hydration tests, adds a bunch, and adds ngh annotations for defer blocks.

Lets test it out!

It WORKS! IT WORKS!

this adds serialized defer block details for partial hydration

This should be able to look through and find all the nodes with ngh and the appropriate triggers for partial hydration.

This adds non-jsaction events and starts to get them working

This adds functionality for all the partial hydration triggers.

This adds a never hydrate trigger.

this ensures the injection of the partial hydration token is optional and defaults to false.

this adds hydrate cleanup to trigger cleanup invocation.

defer triggers would be called regardless of the hydrate trigger presence. This ensures they are not called when on initial load and have a hydrate flag.

Partial hydration cases are nuanced in when they need to be cleaned up. This adds the right conditions to avoid over and under cleaning up of nodes.

Hydrate viewport will always be adjacent to a defer trigger. So hydrate triggers should never cause a missing placeholder error to occur.

In some cases, hydrate triggers were being used as a default due to a problem in the ingest parsing. This ensures idle is added as default in the right cases.

event replay was firing too early in some cases due to an early return of a null.

cleanup was causing overzealous removal of content because the app was not yet stable.