public static ShenyuGrpcClient getGrpcClient(final String selectorId) {
        return CLIENT_CACHE.get(selectorId);
    }
Get the client.

@param selectorId selectorId
@return ShenyuGrpcClient shenyuGrpcClient
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-grpc/src/main/java/org/apache/shenyu/plugin/grpc/cache/GrpcClientCache.java