Move Local Source to separate module (#9152)

* Move Local Source to separate module

* Review changes

source-local/src/main/java/tachiyomi/source/local/io/LocalSourceFileSystem.kt

@@ -0,0 +1,14 @@
+package tachiyomi.source.local.io
+
+import java.io.File
+
+interface LocalSourceFileSystem {
+
+    fun getBaseDirectories(): Sequence<File>
+
+    fun getFilesInBaseDirectories(): Sequence<File>
+
+    fun getMangaDirectory(name: String): File?
+
+    fun getFilesInMangaDirectory(name: String): Sequence<File>
+}