✨ feat(domain): add announcement entity

backend/streetdrop-domain/src/main/java/com/depromeet/announcement/Announcement.java

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+package com.depromeet.announcement;
+
+import static lombok.AccessLevel.PROTECTED;
+
+import com.depromeet.common.entity.BaseTimeEntity;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor(access = PROTECTED)
+@Entity
+public class Announcement extends BaseTimeEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "announcement_id")
+    private Long id;
+
+    @Column(nullable = false, length = 200)
+    private String title;
+
+    @Column(nullable = false, length = 3000)
+    private String content;
+
+    @Builder
+    public Announcement(String title, String content) {
+        this.title = title;
+        this.content = content;
+    }
+}

backend/streetdrop-domain/src/main/resources/db/migration/V20240606__add_announcement_table.sql

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+CREATE TABLE IF NOT EXISTS announcement (
+    announcement_id BIGINT NOT NULL AUTO_INCREMENT,
+    title VARCHAR(200) NOT NULL,
+    content VARCHAR(3000) NOT NULL,
+    created_at DATETIME(6) NOT NULL,
+    modified_at DATETIME(6) NOT NULL
+)