[AFP-73] 🌱 Add managers collection seeder [@asegers]

backend/order-management/src/main/java/com/afp/ordermanagement/seeder/ManagerSeeder.java

+package com.afp.ordermanagement.seeder;
+
+import com.afp.ordermanagement.model.Manager;
+import com.afp.ordermanagement.repository.ManagerRepository;
+import com.github.javafaker.Faker;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+
+import java.util.stream.IntStream;
+
+@Component
+public class ManagerSeeder {
+    @Autowired
+    ManagerRepository managerRepository;
+
+    static private final Faker FAKER = new Faker();
+
+    static private final int SEED_COUNT = 1;
+
+    @EventListener
+    public void seedManager(ContextRefreshedEvent event) {
+        managerRepository
+                .deleteAll()
+                .subscribe();
+        IntStream.range(0, SEED_COUNT).forEach(n -> {
+            managerRepository
+                    .insert(generateManager())
+                    .subscribe();
+        });
+    }
+
+    private Manager generateManager(){
+        Manager manager = new Manager();
+        manager.setFirstName(FAKER.name().firstName());
+        manager.setLastName(FAKER.name().lastName());
+        manager.setEmail(FAKER.internet().emailAddress());
+        manager.setGoogleId(FAKER.number().digits(21));
+        manager.setImageUrl(FAKER.internet().url());
+        return manager;
+    }
+}