feat(fullstack): Read user out of JWT and persist with created and last modified

legalconsenthub-backend/src/main/kotlin/com/betriebsratkanzlei/legalconsenthub/user/UserMapper.kt

@@ -0,0 +1,21 @@
+package com.betriebsratkanzlei.legalconsenthub.user
+
+import com.betriebsratkanzlei.legalconsenthub_api.model.UserDto
+import org.springframework.stereotype.Component
+
+@Component
+class UserMapper() {
+    fun toUserDto(user: User): UserDto {
+        return UserDto(
+            id = user.id,
+            name = user.name,
+        )
+    }
+
+    fun toUser(userDto: UserDto): User {
+        return User(
+            id = userDto.id,
+            name = userDto.name,
+        )
+    }
+}