added labels input to save_url method

[naveennamani]

📑 Description

Now, labels can be added when saving a url by calling with save_url(url, ["label1", "label2"]).

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[yazdipour]

Hey Naveen, Thanks for your contribution. You need to update the unittest to match your changes before PR.

[naveennamani]

Dear @yazdipour, I've added a unittest test case test_save_url_with_labels. Also, I fixed an error in passing the input values, and all the test cases are now passing.