Merge pull request #36551 from CongMinYin/immutable_object_cache_throttle

tools: add throttle mechanism to immutable object cache

Reviewed-by: Jason Dillaman <dillaman@redhat.com>

diff --cc src/common/options.cc
Simple merge

diff --cc src/test/immutable_object_cache/test_object_store.cc
Simple merge

diff --cc src/tools/immutable_object_cache/ObjectCacheStore.cc
Simple merge