Adapter Interface should not enforce constructor

https://github.com/cloudflare/cloudflare-php/blob/master/src/Adapter/Adapter.php#L26

```
interface Adapter
{
/**
* Adapter constructor.
*
* @param Auth $auth
* @param string $baseURI
*/
public function __construct(Auth $auth, string $baseURI);
```
An interface should not enforce any constructor as this is an implementation-issue

Start with src/Adapter/Adapter.php around line 26 and read the Adapter interface and its constructor declaration. Done means the interface no longer enforces an implementation-specific constructor; check the repository's adapter implementations for compatibility and run the relevant test suite if available.

Scritto dal modello di indicizzazione a partire dal testo della issue.