Doctrine 3+ support

[itsgoingd]

• This PR adds support for Doctrine versions 3 and up.
• Doctrine 3 support is implemented via a middleware and requires manual configuration as Doctrine does not allow adding middleware on runtime (examples below).
• Doctrine 2 is still supported with no breaking changes (the SQLLogger implementation has been extracted into a separate class, it's unlikely this affects anyone).

Using the configure helper to register the middleware:

$clockwork->addDataSource($dataSource = new \Clockwork\DataSource\DoctrineDataSource);

$config = ORMSetup::createAttributeMetadataConfiguration(paths: [__DIR__], isDevMode: true);
$config = $dataSource->configure($config);

Manually adding the middleware:

$clockwork->addDataSource($dataSource = new \Clockwork\DataSource\DoctrineDataSource);

$config = ORMSetup::createAttributeMetadataConfiguration(paths: [__DIR__], isDevMode: true)
    ->setMiddlewares([ $dataSource->middleware() ]);