feat: implement get_handle function

[Mystic-Nayy]

feat: implement get_handle function
resolves #72

[codeWhizperer]

Gm @Gift-Naomi, thanks for the update. Could you extend the test cases. Try testing for more than a user and also a test that panics if you try to get_handle with invalid token_id. Thanks

[Mystic-Nayy]

Gm @Gift-Naomi, thanks for the update. Could you extend the test cases. Try testing for more than a user and also a test that panics if you try to get_handle with invalid token_id. Thanks

@codeWhizperer I just did.

[codeWhizperer]

@all-contributors please add @Gift-Naomi for code

[allcontributors]

@codeWhizperer

I've put up a pull request to add @Gift-Naomi! 🎉