Add StickerPackId and StickerPackKey value classes.

app/src/main/java/org/thoughtcrime/securesms/database/StickerTable.kt

@@ -252,10 +252,10 @@ class StickerTable(
     notifyStickerPackListeners()
   }
 
-  fun markPackAsInstalled(packKey: String, notify: Boolean) {
+  fun markPackAsInstalled(packId: String, notify: Boolean) {
     updatePackInstalled(
       db = databaseHelper.signalWritableDatabase,
-      packId = packKey,
+      packId = packId,
       installed = true,
       notify = notify
     )

app/src/main/java/org/thoughtcrime/securesms/database/model/StickerPackRecord.kt

@@ -3,7 +3,7 @@ package org.thoughtcrime.securesms.database.model
 import java.util.Optional
 
 /**
- * Represents a record for a sticker pack in the [StickerTable].
+ * Represents a record for a sticker pack in the [org.thoughtcrime.securesms.database.StickerTable].
  */
 data class StickerPackRecord(
   @JvmField val packId: String,
@@ -19,3 +19,15 @@ data class StickerPackRecord(
   @JvmField
   val authorOptional: Optional<String> = if (author.isBlank()) Optional.empty() else Optional.of(author)
 }
+
+/**
+ * A unique identifier for a sticker pack.
+ */
+@JvmInline
+value class StickerPackId(val value: String)
+
+/**
+ * An encryption key for a sticker pack.
+ */
+@JvmInline
+value class StickerPackKey(val value: String)