DP-460 Upgrade to PHP 8.1 / Laravel 9

- Update dependencies
- Get rid of global helper functions
- Alter error handling
- Change the metadata retrieval logic
- Get rid of use adapter pattern directly, use the FilesystemOperator instead
- Change mime type detector
- Get rid of old info normalizers
- Fix Cache-Control headers
- Refactor blob streaming in order to support file caching
- Lock WebDAV adaptor version

We captured the version of the WebDAV adaptor because we found a problem
with the directory creation. WebDav v3.1.1 does not have this problem.
Need to unlock the version after fixing this bug in the adapter.

composer.json

@@ -34,9 +34,10 @@
   "minimum-stability": "dev",
   "prefer-stable":     true,
   "require":     {
-    "dreamfactory/df-core": "~0.25",
-    "league/flysystem-sftp": "^1.0",
-    "league/flysystem-webdav": "^1.0"
+    "dreamfactory/df-core": "~1.0",
+    "league/flysystem-ftp": "^3.0",
+    "league/flysystem-sftp-v3": "^3.0",
+    "league/flysystem-webdav": "3.1.1"
   },
   "require-dev": {
     "phpunit/phpunit": "@stable"