Use Flow in ExtensionManager and SourceManager (#7547)

- Replace ExtensionManager relay and observable with Flow
- Inverse SourceManager dependency
    - SourceManager observers ExtensionManager flow
- Separate SourceData from SourceRepository as it created a circular dependency

app/src/main/java/eu/kanade/data/source/SourceDataRepositoryImpl.kt

@@ -0,0 +1,23 @@
+package eu.kanade.data.source
+
+import eu.kanade.data.DatabaseHandler
+import eu.kanade.domain.source.model.SourceData
+import eu.kanade.domain.source.repository.SourceDataRepository
+import kotlinx.coroutines.flow.Flow
+
+class SourceDataRepositoryImpl(
+    private val handler: DatabaseHandler,
+) : SourceDataRepository {
+
+    override fun subscribeAll(): Flow<List<SourceData>> {
+        return handler.subscribeToList { sourcesQueries.findAll(sourceDataMapper) }
+    }
+
+    override suspend fun getSourceData(id: Long): SourceData? {
+        return handler.awaitOneOrNull { sourcesQueries.findOne(id, sourceDataMapper) }
+    }
+
+    override suspend fun upsertSourceData(id: Long, lang: String, name: String) {
+        handler.await { sourcesQueries.upsert(id, lang, name) }
+    }
+}

app/src/main/java/eu/kanade/data/source/SourceRepositoryImpl.kt

@@ -2,7 +2,6 @@ package eu.kanade.data.source
 
 import eu.kanade.data.DatabaseHandler
 import eu.kanade.domain.source.model.Source
-import eu.kanade.domain.source.model.SourceData
 import eu.kanade.domain.source.repository.SourceRepository
 import eu.kanade.tachiyomi.source.LocalSource
 import eu.kanade.tachiyomi.source.SourceManager
@@ -50,12 +49,4 @@ class SourceRepositoryImpl(
             }
         }
     }
-
-    override suspend fun getSourceData(id: Long): SourceData? {
-        return handler.awaitOneOrNull { sourcesQueries.getSourceData(id, sourceDataMapper) }
-    }
-
-    override suspend fun upsertSourceData(id: Long, lang: String, name: String) {
-        handler.await { sourcesQueries.upsert(id, lang, name) }
-    }
 }