Add PDO adapter + Symfony DBAL-style prepared statement API (fully BC)

[Copilot]

Moves toward a Symfony DBAL-style query interface backed by PDO and native prepared statements, while keeping the existing MySQLi/interpolated-SQL path entirely intact.

New surface area

• PdoAdapter — drop-in AdapterInterface replacement using PDO. Also implements PreparedStatementAdapterInterface so parameterised dispatch is automatic.
• PreparedStatementAdapterInterface — opt-in interface with a single method executeWithParams(string $sql, array $params). MySQLi does not implement it; all existing code is unaffected.
• Connection::executeQuery() / Connection::executeStatement() — Symfony DBAL-style entry points. Route to executeWithParams() when the adapter supports it, otherwise fall back silently to execute().
• AbstractQuery::toSql() — returns [string $sql, array $bindings] with ? placeholders intact. Scalar, array (IN-list), and nested sub-query bindings are all handled. getString() / assemble() are not changed.

ConnectionFactory

Set driver => pdo_mysql or use_pdo => true in the connection config to get a PDO-backed connection wired through the existing MySqlConnector (charset, timezone, strict-mode all applied).

Usage

// Raw parameterised SQL — works with any adapter
$result   = $conn->executeQuery('SELECT * FROM users WHERE id = ?', [42]);
$affected = $conn->executeStatement('UPDATE users SET active=? WHERE id=?', [1, 42]);

// Query builder → toSql() → executeQuery()
[$sql, $params] = $conn->newSelect()
    ->from('users')
    ->where('id = ?', 42)
    ->where('active = ?', 1)
    ->toSql();
$result = $conn->executeQuery($sql, $params);

// Opt-in to PDO via factory config
$conn = $factory->make(['driver' => 'pdo_mysql', 'host' => '…', …]);

Note: PdoAdapter cannot be named Pdo — PHP's case-insensitive class registry collides with the built-in \PDO.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/CarbonPHP/carbon-doctrine-types/zipball/18ba5ddfec8976260ead6e866180bd5d2f71aa1d
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• https://api.github.com/repos/CarbonPHP/carbon/zipball/f438fcc98f92babee98381d399c65336f3a3827f
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• https://api.github.com/repos/alcohol/iso3166/zipball/928ac7ecc569db9123a83ef5b1c6efc279e7cb49
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• https://api.github.com/repos/brick/math/zipball/63422359a44b7f06cae63c3b429b59e8efcc0629
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• https://api.github.com/repos/bytic/Collections/zipball/d187ad0a5f4731fcc686c2ea97a64fd9e932a57f
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• https://api.github.com/repos/symfony/cache-contracts/zipball/5d68a57d66910405e5c0b63d6f0af941e66fc868
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• https://api.github.com/repos/symfony/cache/zipball/e3e76b9ba0dff3dfe08ebda500723976dd9de407
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• https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493
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• https://api.github.com/repos/symfony/polyfill-php80/zipball/0cc9dd0f17f61d8131e7df6b84bd344899fe2608
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• https://api.github.com/repos/symfony/translation-contracts/zipball/450d4172653f38818657022252f9d81be89ee9a8
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• https://api.github.com/repos/symfony/var-exporter/zipball/03a60f169c79a28513a78c967316fbc8bf17816f
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