Creates a signed upload URL. Signed upload URLs can be used to upload files to the bucket without further authentication. They are valid for 2 hours.
buckets table permissions: noneobjects table permissions: insertThe file path, including the current file name. For example `"folder/image.png"`.
response = (
    supabase.storage
    .from_("avatars")
    .create_signed_upload_url("folder/avatar1.png")
)