[fix](memtracker) Process physical mem check does not include tc/jemalloc allocator cache (#12688)

tcmalloc/jemalloc allocator cache does not participate in the mem check as part of the process physical memory.

because new/malloc will trigger mem hook when using tcmalloc/jemalloc allocator cache, but it may not actually alloc physical memory, which is not expected in mem hook fail.

in addition:

The value of tcmalloc/jemalloc allocator cache is used as a mem tracker, the parent is the process mem tracker, which is updated every 1s.
Modify the process default mem_limit to 90%. expect mem tracker to effectively limit the memory usage of the process.

be/src/runtime/exec_env_init.cpp

@@ -216,6 +216,7 @@ Status ExecEnv::_init_mem_tracker() {
     }
 #endif
 
+    _allocator_cache_mem_tracker = std::make_shared<MemTracker>("Tc/JemallocAllocatorCache");
     _query_pool_mem_tracker =
             std::make_shared<MemTrackerLimiter>(-1, "QueryPool", _process_mem_tracker);
     REGISTER_HOOK_METRIC(query_mem_consumption,