build error when trying to use RocksCacheLibWrapper code example

[gaowayne]

Describe the bug
A clear and concise description of what the bug is.
build error, missing key files to leverage RocksCacheLibWrapper

To Reproduce
Steps to reproduce the behavior:

1. build one small app, make RocksCacheLibWrapper as RocksDB 2nd cache. but I saw the build error for my example code, looks like this RocksCacheLibWrapper code is broken.

[ 33%] Building CXX object CMakeFiles/rocksdb_cachelib_example.dir/main.cpp.o
In file included from /mnt/nvme0n1/rocksdb/rocksdb_cachelib_example/main.cpp:7:
/mnt/nvme0n1/rocksdb/rocksdb_cachelib_example/rocks_secondary_cache/CachelibWrapper.h:19:10: fatal error: cachelib/facebook/admin/CacheAdmin.h: No such file or directory
   19 | #include "cachelib/facebook/admin/CacheAdmin.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/rocksdb_cachelib_example.dir/build.make:76: CMakeFiles/rocksdb_cachelib_example.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/rocksdb_cachelib_example.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

Expected behavior
A clear and concise description of what you expected to happen.
there is great example to show how rocksdb 2nd cache talk to cachelib
Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS] FedoraOS40
• Browser [e.g. chrome, safari] Chrome
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.