feat: implement medal feature

backend/src/main/java/com/openisle/dto/CommentMedalDto.java

@@ -0,0 +1,11 @@
+package com.openisle.dto;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class CommentMedalDto extends MedalDto {
+    private long currentCommentCount;
+    private long targetCommentCount;
+}

backend/src/main/java/com/openisle/dto/MedalDto.java

@@ -0,0 +1,13 @@
+package com.openisle.dto;
+
+import com.openisle.model.MedalType;
+import lombok.Data;
+
+@Data
+public class MedalDto {
+    private String icon;
+    private String title;
+    private String description;
+    private MedalType type;
+    private boolean completed;
+}

backend/src/main/java/com/openisle/dto/PostMedalDto.java

@@ -0,0 +1,11 @@
+package com.openisle.dto;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class PostMedalDto extends MedalDto {
+    private long currentPostCount;
+    private long targetPostCount;
+}

backend/src/main/java/com/openisle/dto/SeedUserMedalDto.java

@@ -0,0 +1,11 @@
+package com.openisle.dto;
+
+import java.time.LocalDateTime;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class SeedUserMedalDto extends MedalDto {
+    private LocalDateTime registerDate;
+}