Add isTagsExclusionSupported flag

src/main/kotlin/org/koitharu/kotatsu/parsers/MangaParser.kt

@@ -42,6 +42,11 @@ abstract class MangaParser @InternalParsersApi constructor(
 	 */
 	open val isMultipleTagsSupported: Boolean = true
 
+	/**
+	 * Whether parser supports tagsExclude field in filter
+	 */
+	open val isTagsExclusionSupported: Boolean = false
+
 	@Deprecated(
 		message = "Use availableSortOrders instead",
 		replaceWith = ReplaceWith("availableSortOrders"),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/BentomangaParser.kt

@@ -32,6 +32,8 @@ internal class BentomangaParser(context: MangaLoaderContext) : PagedMangaParser(
 	override val availableStates: Set<MangaState> =
 		EnumSet.of(MangaState.ONGOING, MangaState.FINISHED, MangaState.PAUSED, MangaState.ABANDONED)
 
+	override val isTagsExclusionSupported = true
+
 	init {
 		paginator.firstPage = 0
 		searchPaginator.firstPage = 0