Implemented alternate approach to current joint_permissions

Is a tweak upon the existing approach, mainly to store and query role
permission access in a way that allows muli-level states that may
override eachother. These states are represented in the new PermissionStatus
class.

This also simplifies how own permissions are stored and queried, to be
part of a single column.

database/migrations/2023_01_24_104625_refactor_joint_permissions_storage.php

@@ -0,0 +1,52 @@
+<?php
+
+use BookStack\Auth\Permissions\JointPermissionBuilder;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+class RefactorJointPermissionsStorage extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        // Truncate before schema changes to avoid performance issues
+        // since we'll need to rebuild anyway.
+        DB::table('joint_permissions')->truncate();
+
+        if (Schema::hasColumn('joint_permissions', 'owned_by')) {
+            Schema::table('joint_permissions', function (Blueprint $table) {
+                $table->dropColumn(['has_permission', 'has_permission_own', 'owned_by']);
+
+                $table->unsignedTinyInteger('status')->index();
+                $table->unsignedInteger('owner_id')->nullable()->index();
+            });
+        }
+
+        // Rebuild permissions
+        app(JointPermissionBuilder::class)->rebuildForAll();
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        DB::table('joint_permissions')->truncate();
+
+        Schema::table('joint_permissions', function (Blueprint $table) {
+            $table->dropColumn(['status', 'owner_id']);
+
+            $table->boolean('has_permission')->index();
+            $table->boolean('has_permission_own')->index();
+            $table->unsignedInteger('created_by')->index();
+        });
+    }
+}