Migrate duplicate manga check to SQLDelight

Extracted from #7244

Co-authored-by: ivaniskandar <ivaniskandar@users.noreply.github.com>

app/src/main/sqldelight/data/mangas.sq

@@ -58,6 +58,13 @@ FROM mangas
 WHERE favorite = 1
 AND source = :sourceId;
 
+getDuplicateLibraryManga:
+SELECT *
+FROM mangas
+WHERE favorite = 1
+AND LOWER(title) = :title
+AND source != :source;
+
 resetViewerFlags:
 UPDATE mangas
 SET viewer = 0;