Add createRequest method to allow timeout configuration through subclassing

[Copilot]

This PR addresses the inability to set custom network timeouts when using ODataClient->request(). Previously, ODataRequest::__construct() hardcoded the timeout to 0 with no way to override it, and ODataClient->request() directly instantiated and executed the request.

Problem

Users could not configure custom timeouts without overriding the entire ODataClient::request() method, which is cumbersome and error-prone.

Solution

Added a protected createRequest() method to ODataClient that can be overridden in subclasses to customize request creation, including setting custom timeouts.

Changes

• Added ODataClient::createRequest() - Protected method that creates ODataRequest instances
• Modified ODataClient::request() - Now uses createRequest() instead of direct instantiation
• Updated README.md - Added "Advanced Usage" section with custom timeout configuration examples
• Maintains full backward compatibility - All existing code continues to work unchanged

Usage

class CustomTimeoutODataClient extends ODataClient {
    private $customTimeout;
    
    public function __construct($baseUrl, $authProvider = null, $httpProvider = null, $timeout = 30) {
        parent::__construct($baseUrl, $authProvider, $httpProvider);
        $this->customTimeout = $timeout;
    }
    
    protected function createRequest($method, $requestUri) {
        $request = parent::createRequest($method, $requestUri);
        $request->setTimeout($this->customTimeout);
        return $request;
    }
}

// Usage
$httpProvider = new GuzzleHttpProvider();
$client = new CustomTimeoutODataClient('https://api.example.com/odata', null, $httpProvider, 60);
$result = $client->from('Products')->get(); // Uses 60-second timeout

This approach follows the template method pattern and allows users to customize request creation without having to override the entire request flow.

Fixes #118.

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[anderly]

@copilot update the readme to mention usage

[Copilot]

@copilot update the readme to mention usage

I've updated the README.md with an "Advanced Usage" section that includes documentation for the custom timeout configuration feature. The section shows how to subclass ODataClient and override the createRequest method to set custom timeouts. Commit: a4ff3ed