validation: move validation crate to crates folder

Cargo.toml

@@ -2,6 +2,7 @@
 members = [
     "crates/auth",
     "crates/domain",
+    "crates/validation",
     "server",
     "app",
     "migration-tool",

app/Cargo.toml

@@ -61,7 +61,7 @@ path = "../crates/auth"
 features = [ "opaque_client" ]
 
 [dependencies.lldap_validation]
-path = "../validation"
+path = "../crates/validation"
 
 [dependencies.image]
 features = ["jpeg"]

server/Cargo.toml

@@ -92,7 +92,7 @@ path = "../crates/domain"
 features = ["test"]
 
 [dependencies.lldap_validation]
-path = "../validation"
+path = "../crates/validation"
 
 [dependencies.opaque-ke]
 version = "0.7"