Support for PHP 8.4

[Nick-S-2018]

We need to test the client with PHP 8.4 to make sure everything works fine.

[sanikolaev]

For now if it's not supported let's mention it in the support matrix in https://github.com/manticoresoftware/manticoresearch-php/blob/master/README.md

[CicerBro]

This is holding back my 8.4 upgrade. Would be nice to have this work.

Currently running into errors like:

   DEPRECATED  Manticoresearch\Client::__construct(): Implicitly marking parameter $logger as nullable is deprecated, the explicit nullable type must be used instead in vendor/manticoresoftware/manticoresearch-php/src/Manticoresearch/Client.php on line 63.


   DEPRECATED  Manticoresearch\Client::index(): Implicitly marking parameter $name as nullable is deprecated, the explicit nullable type must be used instead in vendor/manticoresoftware/manticoresearch-php/src/Manticoresearch/Client.php on line 304.


   DEPRECATED  Manticoresearch\Transport::__construct(): Implicitly marking parameter $connection as nullable is deprecated, the explicit nullable type must be used instead in vendor/manticoresoftware/manticoresearch-php/src/Manticoresearch/Transport.php on line 34.


   DEPRECATED  Manticoresearch\Transport::__construct(): Implicitly marking parameter $logger as nullable is deprecated, the explicit nullable type must be used instead in vendor/manticoresoftware/manticoresearch-php/src/Manticoresearch/Transport.php on line 34.


   DEPRECATED  Manticoresearch\Transport\Http::__construct(): Implicitly marking parameter $connection as nullable is deprecated, the explicit nullable type must be used instead in vendor/manticoresoftware/manticoresearch-php/src/Manticoresearch/Transport/Http.php on line 35.


   DEPRECATED  Manticoresearch\Transport\Http::__construct(): Implicitly marking parameter $logger as nullable is deprecated, the explicit nullable type must be used instead in vendor/manticoresoftware/manticoresearch-php/src/Manticoresearch/Transport/Http.php on line 35.

[sanikolaev]

@CicerBro would you like to make a PR which adapts the code to PHP 8.4?