feat: accept datetime.timedelta for timeout parameters (#3059)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Skn0tt

playwright/_impl/_helper.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import asyncio
+import datetime
 import math
 import os
 import re
@@ -574,3 +575,13 @@ def is_file_payload(value: Optional[Any]) -> bool:
 
 def is_textual_mime_type(mime_type: str) -> bool:
     return bool(TEXTUAL_MIME_TYPE.match(mime_type))
+
+
+def to_milliseconds(
+    value: Union[float, datetime.timedelta, None],
+) -> Optional[float]:
+    if value is None:
+        return None
+    if isinstance(value, datetime.timedelta):
+        return value / datetime.timedelta(milliseconds=1)
+    return value