Add developer option to tweak All Apps from Overview threshold.

Ability to move threshold from shift 1.05 to 5.0. Saved as an int
from 105 to 500. Shift 1.0 is where Overview rests; using this
value exactly causes a slight glitch while settling.

Demo (slightly outdated min value and flavor text):
https://drive.google.com/file/d/1PaS4MjFM1P9ZHQ-400tXUbDz_-z8qYtC/view?usp=drive_link&resourcekey=0-ZX-ofW4AzN0-Qjqo4OmU-g

Bug: 281717218
Test: Manual
Flag: ENABLE_ALL_APPS_FROM_OVERVIEW
Change-Id: I5acfb46f9df16e9d3091a7822c449301bc6067f9
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index cc1c0f5..4b7aeeb 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -62,6 +62,7 @@
 
     public static final String ACTION_FORCE_ROLOAD = "force-reload-launcher";
     public static final String KEY_ICON_STATE = "pref_icon_shape_path";
+    public static final String KEY_ALL_APPS_OVERVIEW_THRESHOLD = "pref_all_apps_overview_threshold";
 
     // We do not need any synchronization for this variable as its only written on UI thread.
     public static final MainThreadInitializedObject<LauncherAppState> INSTANCE =