Add push notification extensions (#4005)

* add wav

* add sound to config

* add extension to `updateExtensions.sh`

* add ios source files

* add a build extension

* add a new module

* use correct type on ios

* update the build plugin

* add android handler

* create a patch for expo-notifications

* basic android implementation

* add entitlements for notifications extension

* add some generic logic for ios

* add age check logic

* add extension to app config

* remove dash

* move directory

* rename again

* update privacy manifest

* add prefs storage ios

* better types

* create interface for setting and getting prefs

* add notifications prefs for android

* add functions to module

* add types to js

* add prefs context

* add web stub

* wrap the app

* fix types

* more preferences for ios

* add a test toggle

* swap vars

* update patch

* fix patch error

* fix typo

* sigh

* sigh

* get stored prefs on launch

* anotehr type

* simplify

* about finished

* comment

* adjust plugin

* use supported file types

* update NSE

* futureproof ios

* futureproof android

* update sound file name

* handle initialization

* more cleanup

* update js types

* strict js types

* set the notification channel

* rm

* add silent channel

* add mute logic

* update patch

* podfile

* adjust channels

* fix android channel

* update readme

* oreo or higher

* nit

* don't use getValue

* nit

modules/expo-background-notification-handler/ios/ExpoBackgroundNotificationHandler.podspec

@@ -0,0 +1,21 @@
+Pod::Spec.new do |s|
+  s.name           = 'ExpoBackgroundNotificationHandler'
+  s.version        = '1.0.0'
+  s.summary        = 'Interface for BlueskyNSE preferences'
+  s.description    = 'Interface for BlueskyNSE preferenes'
+  s.author         = ''
+  s.homepage       = 'https://github.com/bluesky-social/social-app'
+  s.platforms      = { :ios => '13.4', :tvos => '13.4' }
+  s.source         = { git: '' }
+  s.static_framework = true
+
+  s.dependency 'ExpoModulesCore'
+
+  # Swift/Objective-C compatibility
+  s.pod_target_xcconfig = {
+    'DEFINES_MODULE' => 'YES',
+    'SWIFT_COMPILATION_MODE' => 'wholemodule'
+  }
+
+  s.source_files = "**/*.{h,m,mm,swift,hpp,cpp}"
+end