Set a smaller LRU rule cache size

After some testing, it's super hard to hit 2,000 entries.

We'll play it safer with lower-ram systems and limit this to 1,000 for now.

Signed-off-by: Nick Semenkovich <semenko@alum.mit.edu>
Add a smaller cache for cookie domains

Useful as this is a hot path that blocks headers.

Signed-off-by: Nick Semenkovich <semenko@alum.mit.edu>