OPENTHREAD_CONFIG_TMF_ADDRESS_CACHE_MAX_SNOOP_ENTRIES macro

@def OPENTHREAD_CONFIG_TMF_ADDRESS_CACHE_MAX_SNOOP_ENTRIES The maximum number of EID-to-RLOC cache entries that can be used for "snoop optimization" where an entry is created by inspecting a received message. By default a 1/16 fraction of `OPENTHREAD_CONFIG_TMF_ADDRESS_CACHE_ENTRIES` is used.