fix(metadata): recognize ComicInfo Day tag and "MA15+" rating

These fields are used by comictagger.

komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/comicinfo/ComicInfoProvider.kt

@@ -30,7 +30,7 @@ class ComicInfoProvider(
   override fun getBookMetadataFromBook(book: Book, media: Media): BookMetadataPatch? {
     getComicInfo(book, media)?.let { comicInfo ->
       val releaseDate = comicInfo.year?.let {
-        LocalDate.of(comicInfo.year!!, comicInfo.month ?: 1, 1)
+        LocalDate.of(comicInfo.year!!, comicInfo.month ?: 1, comicInfo.day ?: 1)
       }
 
       val authors = mutableListOf<Author>()

komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/comicinfo/dto/AgeRating.kt

@@ -12,6 +12,7 @@ enum class AgeRating(val value: String, val ageRating: Int? = null) {
   KIDS_TO_ADULTS("Kids to Adults", 6),
   M("M", 17),
   MA_15("MA 15+", 15),
+  MA_15_NOSPACE("MA15+", 15),
   MATURE_17("Mature 17+", 17),
   PG("PG", 8),
   R_18("R18+", 18),

komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/comicinfo/dto/ComicInfo.kt

@@ -43,6 +43,9 @@ class ComicInfo {
   @JsonProperty(value = "Month")
   var month: Int? = null
 
+  @JsonProperty(value = "Day")
+  var day: Int? = null
+
   @JsonProperty(value = "Writer")
   var writer: String? = null