add batch download api (#436)

* Add POST /downloads endpoint for creating multiple

* Fix review notes

* Add chapter id to API endpoints

* Rewrite batch chapter download to use chapter id instead of mangaId+chapterIndex combination

* Change EnqueueInput format to be more futureproof

* Change endpoint path

* Change endpoint path

server/src/main/kotlin/suwayomi/tachidesk/manga/model/dataclass/ChapterDataClass.kt

@@ -8,6 +8,7 @@ package suwayomi.tachidesk.manga.model.dataclass
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 data class ChapterDataClass(
+    val id: Int,
     val url: String,
     val name: String,
     val uploadDate: Long,

server/src/main/kotlin/suwayomi/tachidesk/manga/model/table/ChapterTable.kt

@@ -38,6 +38,7 @@ object ChapterTable : IntIdTable() {
 
 fun ChapterTable.toDataClass(chapterEntry: ResultRow) =
     ChapterDataClass(
+        chapterEntry[id].value,
         chapterEntry[url],
         chapterEntry[name],
         chapterEntry[date_upload],