Look into store contents that can be eliminated when using server-side hydration

[stubailo]

There is some data like the query AST that could be eliminated from the server-side hydrated state, reducing its size dramatically. We should look into eliminating that stuff, and having the client deal with its absence appropriately.

One aspect is that #615 will remove one instance of the query AST right away.

Continuation of #660

[helfer]

This is done afaik.