database: add Post model

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

database/src/main/sqldelight/dev/msfjarvis/lobsters/data/local/Post.sq

@@ -0,0 +1,55 @@
+import dev.msfjarvis.lobsters.model.Submitter;
+import kotlin.collections.List;
+
+CREATE TABLE IF NOT EXISTS LobstersPost(
+  short_id TEXT NOT NULL PRIMARY KEY,
+  short_id_url TEXT NOT NULL,
+  created_at TEXT NOT NULL,
+  title TEXT NOT NULL,
+  url TEXT NOT NULL,
+  score INTEGER NOT NULL,
+  flags INTEGER NOT NULL,
+  comment_count INTEGER NOT NULL,
+  description TEXT NOT NULL,
+  comments_url TEXT NOT NULL,
+  submitter_user TEXT as Submitter NOT NULL,
+  tags TEXT as List<String> NOT NULL,
+  is_saved INTEGER DEFAULT 0 NOT NULL
+);
+
+selectAllPosts:
+SELECT *
+FROM LobstersPost;
+
+selectPost:
+SELECT *
+FROM LobstersPost
+WHERE short_id = ?;
+
+insertOrReplacePost:
+INSERT OR REPLACE
+INTO LobstersPost
+VALUES ?;
+
+savePost:
+UPDATE LobstersPost
+SET is_saved = 1
+WHERE short_id = ?;
+
+removeSavedPost:
+UPDATE LobstersPost
+SET is_saved = 0
+WHERE short_id = ?;
+
+deletePost:
+DELETE
+FROM LobstersPost
+WHERE short_id = ?;
+
+deleteAllPosts:
+DELETE
+FROM LobstersPost;
+
+selectCount:
+SELECT COUNT(*)
+FROM LobstersPost;