Storage backed VDOM trees and hook states

[Archmonger]

Current Situation

All VDOM and hooks are currently stored entirely in memory. The use of additional system ram for each component could potentially be a problem for scaling an application to service hundreds of thousands of users.

Proposed Actions

One of the two options a potential solution is to allow for VDOM and hook states to be backed by Redis and/or a database. This would allow us to create a variant of ReactPy that does not require websockets, and instead operate off the stateless HTTP.

Evicting old states becomes a challenge with these designs, but is not impossible to handle.