Add type detection for PDOStatement::fetchAll(PDO::FETCH_CLASS, SomeClass::class)

Example fetchAll: https://psalm.dev/r/a9b0c85b47

Add type detection for PDOStatement::fetchAll(PDO::FETCH_CLASS, SomeClass::class): SomeClass[]|false;

Currently PDOStatement::fetchAll() is currently defined as:
```
'PDOStatement::fetchAll' => ['array', 'mode='=>'int', '...args='=>'mixed'],
```
which infers to array<array-key, mixed> instead of array<array-key, SomeClass>