Implemented the User Lists endpoints (#14)

This PR contains the work done to implement the *User Lists* endpoints of the *Discogs API* service in the `Open API` specification document:

* GET `/users/{username}/lists`
* GET `/lists/{list_id}`

Reviewed-on: #14
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

docs/data/documentation/discogsservice/useragentmiddleware/clientmiddleware-implementations.json

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