prop224: Client introduction point failure cache
Implement the introduction point failure cache for proposal 224.
This can be found in the legacy code in src/or/rendcache.c. See strmap_t *rend_cache_failure
and functions starting with rend_cache_failure_*
.
We could re-use it but refactoring would be needed since some of the functions expects a rend_service_descriptor_t
and they are indexed by service_id
(onion address).