Get rid of distutils to support Python 3.12

Fix #1962

sdk/python/packages/flet-runtime/src/flet_runtime/utils.py

@@ -1,6 +1,7 @@
 import json
 import os
 import re
+import shutil
 import socket
 import sys
 from pathlib import Path
@@ -258,3 +259,25 @@ def patch_manifest_json(
 
     with open(manifest_path, "w") as f:
         f.write(json.dumps(manifest, indent=2))
+
+
+def copy_tree(src, dst):
+    """Recursively copy a directory tree using shutil.copy2().
+
+    Arguments:
+    src -- source directory path
+    dst -- destination directory path
+
+    Return a list of files that were copied or might have been copied.
+    """
+    if not os.path.isdir(src):
+        raise OSError("Source is not a directory")
+
+    os.makedirs(dst, exist_ok=True)
+    for item in os.listdir(src):
+        s = os.path.join(src, item)
+        d = os.path.join(dst, item)
+        if os.path.isdir(s):
+            copy_tree(s, d)
+        else:
+            shutil.copy2(s, d)

sdk/python/packages/flet/src/flet/__pyinstaller/utils.py

@@ -1,10 +1,9 @@
 import os
 import tempfile
 import uuid
-from distutils.dir_util import copy_tree
 from pathlib import Path
 
-from flet_runtime.utils import get_package_bin_dir
+from flet_runtime.utils import copy_tree, get_package_bin_dir
 
 
 def get_flet_bin_path():

sdk/python/packages/flet/src/flet/cli/commands/publish.py

@@ -6,13 +6,13 @@
 import sys
 import tarfile
 import tempfile
-from distutils.dir_util import copy_tree
 from pathlib import Path
 
 from flet.cli.commands.base import BaseCommand
 from flet_core.types import WebRenderer
 from flet_core.utils import random_string
 from flet_runtime.utils import (
+    copy_tree,
     get_package_web_dir,
     is_within_directory,
     patch_index_html,