fix: Accept type string for location and address

[nandenjin]

Description of Change(s):

Fixes #1116

• type Location now includes string (cf: location)
• type Address now includes string (cf: address)
• setLocation() and setAddress return string itself for parameters with type string
• Add unit tests

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

• Updated the documentation
• 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.

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

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

[garmeeh]

Thank you 😄