Update code style

[tomas-novotny]

Better code style with phpcbf and rector tools.

• add param and return types everywhere
• add missing visibility
• replace " -> '
• fix imports
• updated spec/generate.php to match generated code with code style format.

Cleanup composer dependencies with composer-dependency-analyser

Updated phpstan/phpstan: ^2.0 with raised level to 5 -> 7

• add better typehints to callable, array, promises, etc.

-/** @var callable[] */
+/** @var list<callable(\Bunny\Message, \Bunny\Protocol\MethodBasicReturnFrame): void> */
private array $returnCallbacks = [];

• fix return types of generated methods (remove bool if method never returns it)

-public function qos(int $prefetchSize = 0, int $prefetchCount = 0, bool $global = false): bool|Protocol\MethodBasicQosOkFrame
+public function qos(int $prefetchSize = 0, int $prefetchCount = 0, bool $global = false): Protocol\MethodBasicQosOkFrame

• add missing methods to ClientInterface

+public function exchangeDeclare(string $exchange, string $exchangeType = 'direct', bool $passive = false, bool $durable = false, bool $autoDelete = false, bool $internal = false, bool $nowait = false, array $arguments = []): bool|Protocol\MethodExchangeDeclareOkFrame;
+public function exchangeDelete(string $exchange, bool $ifUnused = false, bool $nowait = false): bool|MethodExchangeDeleteOkFrame;
+public function exchangeBind(string $destination, string $source, string $routingKey = '', bool $nowait = false, array $arguments = []): bool|MethodExchangeBindOkFrame;
+public function exchangeUnbind(string $destination, string $source, string $routingKey = '', bool $nowait = false, array $arguments = []): bool|MethodExchangeUnbindOkFrame;
+public function recoverAsync(bool $requeue = false): bool;
+public function recover(bool $requeue = false): bool|MethodBasicRecoverOkFrame;

• remove getOkFrame and getDeferred from Channel - it was never used, removed in b295581

-private ?MethodBasicGetOkFrame $getOkFrame = null;
-private ?Deferred $getDeferred = null;