Add remote authentication for users

- add RemoteReactiveAuthenticationManager
- add RemoteAuthentication
- add RemoteUserDetail
- add AccountRegistryService
- add WebClientCalls.kt with accountRegistryAuthenticate
- add Helper.kt with logCall
- add Mapping.kt toAuthenticationRequest

src/main/kotlin/ltd/hlaeja/util/Mapping.kt

@@ -0,0 +1,10 @@
+package ltd.hlaeja.util
+
+import org.springframework.security.core.Authentication as SpringAuthentication
+
+import ltd.hlaeja.library.accountRegistry.Authentication
+
+fun SpringAuthentication.toAuthenticationRequest(): Authentication.Request = Authentication.Request(
+    principal as String,
+    credentials as String,
+)