Remove fading_edge_scrollview dependency

The `fading_edge_scrollview` package has not been maintained for a while.
This commit removes the dependency and includes its functionality directly within this package.

Author: pratikPSB

CHANGELOG.md

@@ -19,3 +19,7 @@
 ## 1.0.3+1
 
 * Reformatted the package with dart format.
+
+## 1.1.0
+
+* Removed 3rd party package dependency as that was less maintained.

example/.gitignore

@@ -41,3 +41,4 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+/pubspec.lock