feat: Allow QAPage to set URL for author

[amadeusj5]

Description of Change(s):

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Allow QAPage to set author URL if exists. Right now the current behavior would only set the name for the author but in order to improve the SEO we allow now setting the author with name and url if object is passed on (or you can just set the author as a string and it will set the proper structure with the name only) by reusing the setAuthor function logic.

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To help get PR's merged faster, the following is required:

[x] Updated the documentation
[x] Unit/Cypress test covering all cases

Please link to relevant Google Docs or schema.org docs for what you are adding so we can review.
https://developers.google.com/search/docs/appearance/structured-data/qapage

Please have a read of the Contributing Guide for full details.

https://github.com/garmeeh/next-seo/blob/master/CONTRIBUTING.md

Before

After

[amadeusj5]

Hi @garmeeh, can you check this out please? 🙏🏽

[amadeusj5]

Hi @garmeeh any change you can take a look at this? it's a minor change but it will be really helpful for me 🙏🏽

[garmeeh]

Hey @amadeusj5 I'll get this released for you this week.

Could you take a look at the failing tests?

[amadeusj5]

Hi @garmeeh, test updated. Thanks in advance 🙏🏽

[garmeeh]

Amazing. I've set the tests to run. I will release over the weekend then.