Implemented the Authentication endpoints (#9)

This PR contains the work done to implement the *Authentication* endpoints of the Discogs API:
* GET `/oauth/request_token`
* POST `/oauth/access_token`
* GET `/oauth/identity`

Reviewed-on: #9
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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