move worker_task.rs into proxmox-rest-server crate

Also moved pbs-datastore/src/task.rs to pbs-tools, which now depends on 'log'.

src/api2/reader/environment.rs

@@ -10,7 +10,7 @@ use pbs_api_types::Authid;
 use proxmox_rest_server::formatter::*;
 
 use crate::backup::DataStore;
-use crate::server::WorkerTask;
+use proxmox_rest_server::WorkerTask;
 
 //use proxmox::tools;
 

src/api2/reader/mod.rs

@@ -39,12 +39,12 @@ use pbs_datastore::backup_info::BackupDir;
 use pbs_datastore::index::IndexFile;
 use pbs_datastore::manifest::{archive_type, ArchiveType};
 use pbs_config::CachedUserInfo;
+use proxmox_rest_server::WorkerTask;
 
 use crate::{
     api2::helpers,
     backup::DataStore,
     server::{
-        WorkerTask,
         H2Service,
     },
 };