chore(libanki): parents()

https://github.com/ankitects/anki/blob/4fc535ec8810c77838d49252ed83921ff99301a6/pylib/anki/decks.py#L482-L501

AnkiDroid/src/main/java/com/ichi2/libanki/Decks.kt

@@ -490,6 +490,31 @@ class Decks(private val col: Collection) {
         }
     }
 
+    /** All parents of did. */
+    @LibAnkiAlias("parents")
+    fun parents(did: DeckId, nameMap: Map<String, Deck>? = null): List<Deck> {
+        // get parent and grandparent names
+        val parentsNames = mutableListOf<String>()
+        for (part in immediateParentPath(get(did)!!.name)) {
+            if (parentsNames.isEmpty()) {
+                parentsNames.add(part)
+            } else {
+                parentsNames.append("${parentsNames.last()}::$part")
+            }
+        }
+        // convert to objects
+        val parents = mutableListOf<Deck>()
+        for (parentName in parentsNames) {
+            val deck = if (nameMap != null) {
+                nameMap[parentName]
+            } else {
+                get(id(parentName))
+            }!!
+            parents.add(deck)
+        }
+        return parents.toList()
+    }
+
     /*
      * Filtered decks
      *************************************************************