feat(feed): 피드 아이템 계약을 추가한다

app/src/main/java/kr/co/vividnext/sodalive/v2/widget/feed/FeedContentCategory.kt

@@ -0,0 +1,14 @@
+package kr.co.vividnext.sodalive.v2.widget.feed
+
+import androidx.annotation.StringRes
+import kr.co.vividnext.sodalive.R
+
+enum class FeedContentCategory(
+    @StringRes val labelResId: Int,
+    val ratioWidth: Int,
+    val ratioHeight: Int
+) {
+    Content(labelResId = R.string.feed_content_category_content, ratioWidth = 1, ratioHeight = 1),
+    Series(labelResId = R.string.feed_content_category_series, ratioWidth = 163, ratioHeight = 230),
+    Magazine(labelResId = R.string.feed_content_category_magazine, ratioWidth = 163, ratioHeight = 218)
+}

app/src/main/java/kr/co/vividnext/sodalive/v2/widget/feed/FeedItem.kt

@@ -0,0 +1,47 @@
+package kr.co.vividnext.sodalive.v2.widget.feed
+
+sealed class FeedItem(open val feedId: String, val variant: FeedVariant) {
+    data class Rank(
+        override val feedId: String,
+        val imageUrl: String,
+        val rankText: String,
+        val message: String,
+        val highlightRanges: List<FeedRankHighlight>
+    ) : FeedItem(feedId, FeedVariant.Rank)
+
+    data class Live(
+        override val feedId: String,
+        val creatorId: String,
+        val creatorName: String,
+        val creatorImageUrl: String,
+        val liveId: String,
+        val liveTitle: String,
+        val createdAtText: String,
+        val endedMessage: String
+    ) : FeedItem(feedId, FeedVariant.Live)
+
+    data class Content(
+        override val feedId: String,
+        val creatorId: String,
+        val creatorName: String,
+        val creatorImageUrl: String,
+        val contentId: String,
+        val contentTitle: String,
+        val contentImageUrl: String,
+        val createdAtText: String,
+        val category: FeedContentCategory = FeedContentCategory.Content
+    ) : FeedItem(feedId, FeedVariant.Content)
+
+    data class Community(
+        override val feedId: String,
+        val creatorId: String,
+        val creatorName: String,
+        val creatorImageUrl: String,
+        val postId: String,
+        val bodyText: String,
+        val keywordText: String,
+        val createdAtText: String,
+        val commentCount: Int,
+        val likeCount: Int
+    ) : FeedItem(feedId, FeedVariant.Community)
+}

app/src/main/java/kr/co/vividnext/sodalive/v2/widget/feed/FeedVariant.kt

@@ -0,0 +1,8 @@
+package kr.co.vividnext.sodalive.v2.widget.feed
+
+enum class FeedVariant {
+    Rank,
+    Live,
+    Content,
+    Community
+}