moved key_derivation.rs from pbs_datastore to pbs-config/src/key_config.rs

Also moved pbs-datastore/src/crypt_config.rs to pbs-tools/src/crypt_config.rs.
We do not want to depend on pbs-api-types there, so I use [u8;32] instead of
Fingerprint.

src/api2/config/tape_encryption_keys.rs

@@ -12,7 +12,7 @@ use proxmox::{
 };
 
 use pbs_api_types::{Fingerprint, KeyInfo, Kdf};
-use pbs_datastore::key_derivation::KeyConfig;
+use pbs_config::key_config::KeyConfig;
 use pbs_config::open_backup_lockfile;
 
 use crate::{