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.

proxmox-file-restore/Cargo.toml

@@ -20,6 +20,7 @@ proxmox = { version = "0.13.0", features = [ "api-macro", "cli" ] }
 
 pbs-api-types = { path = "../pbs-api-types" }
 pbs-buildcfg = { path = "../pbs-buildcfg" }
+pbs-config = { path = "../pbs-config" }
 pbs-client = { path = "../pbs-client" }
 pbs-datastore = { path = "../pbs-datastore" }
 pbs-runtime = { path = "../pbs-runtime" }