Restrict raw database access to the data module

app no longer touches the database directly. Backup restore's queries move into a new RestoreRepository in :data, which restores a batch of entries all or nothing, stopping between entries if cancelled, as before. The remaining direct calls (excluded scanlators, clear database, backup creation, store and category restore) go through their repositories, and the database bindings move from AppBindings into :data.

core/common/src/main/kotlin/mihon/core/common/extensions/JsonObject.kt

@@ -1,5 +1,6 @@
 package mihon.core.common.extensions
 
+import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
 
 val JsonObjectEmpty = JsonObject(emptyMap())
@@ -8,3 +9,7 @@ val JsonObjectEmptyBytes = byteArrayOf(0x7B, 0x7D)
 
 val JsonObject.Companion.EMPTY: JsonObject
     inline get() = JsonObjectEmpty
+
+fun JsonObject.toByteArray(): ByteArray = toString().encodeToByteArray()
+
+fun ByteArray.toJsonObject(): JsonObject = Json.decodeFromString<JsonObject>(decodeToString())