Integrate Percas as one of the options for the OpenDAL CacheLayer

[Xuanwo]

Hi, thank you very much for creating Percas.

OpenDAL is currently developing its CacheLayer: apache/opendal#5678. We aim to make it a pluggable cache layer, allowing users to swap between different cache implementations. I'm interested in integrating Percas as one of the options for the OpenDAL CacheLayer. With this integration, users would be able to use Percas like this:

let op = op.layer(CacheLayer::with(PercasAdapter::new("http://address_to_percas")))