[11.x] Support auto-discovery of PSR-17 implementations

[hafezdivandari]

The symfony/psr-http-message-bridge supports auto-detecting PSR-17 factories: symfony/symfony#51197

This PR adds support for php-http/discovery on Laravel, that allows auto-discovery of PSR-17 implementations.

You may refer to php-http/discovery readme for more info:

If you use a library/SDK that requires php-http/discovery, you can configure the auto-discovery mechanism to use a specific implementation when many are available in your project.

For example, if you have both nyholm/psr7 and guzzlehttp/guzzle in your project, you can enable the php-http/discovery composer plugin and configure it to use guzzlehttp/guzzle instead of nyholm/psr7 by running the following command:

composer config allow-plugins.php-http/discovery true
composer config extra.discovery.psr/http-factory-implementation GuzzleHttp\\Psr7\\HttpFactory

This will update your composer.json file to add the following configuration:

{
    "config": {
         "allow-plugins": {
             "php-http/discovery": true
        }
    },
    "extra": {
        "discovery": {
            "psr/http-factory-implementation": "GuzzleHttp\\Psr7\\HttpFactory"
        }
    }
}

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