Add ability to getRealm by name on security config

Author: adrienlauer

security/specs/src/main/java/org/seedstack/seed/security/SecurityConfig.java

@@ -16,6 +16,7 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 
 @Config("security")
@@ -39,6 +40,10 @@ public SecurityConfig addRealm(RealmConfig realmConfig) {
         return this;
     }
 
+    public Optional<RealmConfig> getRealm(String name) {
+        return realms.stream().filter(realmConfig -> realmConfig.getName().equals(name)).findFirst();
+    }
+
     public Map<String, UserConfig> getUsers() {
         return Collections.unmodifiableMap(users);
     }