[Optimize][Cache]Implementation of Separated Page Cache (#5008)

#4995
**Implementation of Separated Page Cache**
- Add config "index_page_cache_ratio" to set the ratio of capacity of index page cache
- Change the member of StoragePageCache to maintain two type of cache
- Change the interface of StoragePageCache for selecting type of cache
- Change the usage of page cache in read_and_decompress_page in page_io.cpp
  - add page type as argument
  - check if current page type is available in StoragePageCache (cover the situation of ratio == 0 or 1)
- Add type as argument in superior call of read_and_decompress_page
- Change Unit Test

be/src/runtime/exec_env_init.cpp

@@ -192,7 +192,8 @@ Status ExecEnv::_init_mem_tracker() {
         LOG(WARNING) << "Config storage_page_cache_limit is greater than memory size, config="
                      << config::storage_page_cache_limit << ", memory=" << MemInfo::physical_mem();
     }
-    StoragePageCache::create_global_cache(storage_cache_limit);
+    int32_t index_page_cache_percentage = config::index_page_cache_percentage;
+    StoragePageCache::create_global_cache(storage_cache_limit, index_page_cache_percentage);
 
     // TODO(zc): The current memory usage configuration is a bit confusing,
     // we need to sort out the use of memory