Enforced parameter and return value types in event-related classes

Add proper types to Doctrine\DBAL\Query namespace.

Add proper types to root Doctrine\DBAL namespace.

Add proper types to Doctrine\DBAL\Id namespace.

Add proper types to the Doctrine\DBAL\Sharding namespace.

Add proper types to Doctrine\DBAL\Tools namespace.

Enforced parameter and return value types in Connection classes

Add proper types to Doctrine\DBAL\Types namespace.

Add types to Schema namespace

Enforced parameter and return value types in Platform classes

Enforced parameter and return value types in Driver classes

Removed Driver::getName()

The method is not used for anything else than skipping tests for specific drivers. Cross-driver portability should be established by drivers, not outside of them based on their name.

Remove @​deprecated stuff

Enforced parameter and return value types in Statement classes

Remove deprecated AbstractSchemaManager::getFilterSchemaAssetsExpression(), Configuration::getFilterSchemaAssetsExpression() and Configuration::getFilterSchemaAssetsExpression()

`Connection::ping()` will now return `void`

Remove user provided PDO functionality