Move Glance Widget to seperate module (#8989)

Move Widget to seperate module

- Create a core module for presentation. Widget and App will share some resources and hopefully composables

(cherry picked from commit 12e41b6e6f3b5d95d19e1caa6c9fbe5eb6c9749c)

core/src/main/java/eu/kanade/tachiyomi/util/system/DensityExtensions.kt

@@ -0,0 +1,9 @@
+package eu.kanade.tachiyomi.util.system
+
+import android.content.res.Resources
+
+/**
+ * Converts to px.
+ */
+val Int.dpToPx: Int
+    get() = (this * Resources.getSystem().displayMetrics.density).toInt()