API: Added audit log list endpoint

Not yested covered with testing.
Changes database columns for more presentable names and for future use
to connect additional model types.
For #4316

app/Activity/Controllers/AuditLogApiController.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace BookStack\Activity\Controllers;
+
+use BookStack\Activity\Models\Activity;
+use BookStack\Http\ApiController;
+
+class AuditLogApiController extends ApiController
+{
+    /**
+     * Get a listing of audit log events in the system.
+     * The loggable relation fields currently only relates to core
+     * content types (page, book, bookshelf, chapter) but this may be
+     * used more in the future across other types.
+     * Requires permission to manage both users and system settings.
+     */
+    public function list()
+    {
+        $this->checkPermission('settings-manage');
+        $this->checkPermission('users-manage');
+
+        $query = Activity::query()->with(['user']);
+
+        return $this->apiListingResponse($query, [
+            'id', 'type', 'detail', 'user_id', 'loggable_id', 'loggable_type', 'ip', 'created_at',
+        ]);
+    }
+}