Push Notifications (Mobile and PC) (#13277)

* Update manifest and add service worker
cleanup icons a bit

* Push notifications WIP

* navigate working

* cleanup

* acknowledge wired up

* Set VAPID keys on composer install

* Component to control notification permissions.

* Allow all user option to validate

* Enable on browser load if transport exists.

* Check for transport before showing user permissions
translations

* Documentation

* style fixes

* access via the attribute model

* fix alerting test

* update schema

* cleanup subscription on disable

* non-configurable db and table for webpush subscriptions (respect system connection)

* revert AlertTransport change
hopefully phpstan can figure it out

* phpstan fixes

* Support custom details display

* Match transport names to brand's preferred display

* less duplicate id errors

* Tests are done in Laravel code now so
remove legacy function usage... could be better, but ok

* Style fixes

* Style fixes 2

* Fix alert test

* Doc updates requires HTTPS and GMP

* unregister subscription when permission is set to denied

* cleanup after user deletion

* delete the right thing

* fix whitespace

* update install docs to include php-gmp

* suggest ext-gmp

* update javascript

* Update functions.php

Co-authored-by: Jellyfrog <Jellyfrog@users.noreply.github.com>

database/migrations/2021_09_07_094310_create_push_subscriptions_table.php

@@ -0,0 +1,37 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreatePushSubscriptionsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('push_subscriptions', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->morphs('subscribable');
+            $table->string('endpoint', 500)->unique();
+            $table->string('public_key')->nullable();
+            $table->string('auth_token')->nullable();
+            $table->string('content_encoding')->nullable();
+            $table->string('description')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('push_subscriptions');
+    }
+}