Add fetching additional DataSource fields

[wscourge]

Updates the List Sources and Retrieve a Source to support requesting additional fields with the following query params:

• with_processing_status=true
• with_auto_churn_subscription_setting=true
• with_invoice_handling_setting=true

Using SDK code:

1) List Sources

ChartMogul\DataSource::all([
    'with_processing_status' => true,
    'with_auto_churn_subscription_setting_setting' => true,
    'with_invoice_handling_setting_setting' => true
]);

2) Retrieve a Source

ChartMogul\DataSource::retrieve($uuid, [
    'with_processing_status' => true,
    'with_auto_churn_subscription_setting_setting' => true,
    'with_invoice_handling_setting_setting' => true
]);

[Copilot]

Pull request overview

This PR adds support for fetching additional DataSource fields (processing_status, auto_churn_subscription_setting, and invoice_handling_setting) when listing or retrieving data sources via query parameters.

Key changes:

• Added a new getWithQuery() method to RequestService to support passing query parameters to GET requests
• Modified DataSource class to include new read-only properties and custom retrieve()/get() methods that accept query parameters
• Added comprehensive test coverage for the new functionality

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/Service/RequestService.php	Added getWithQuery() method to support GET requests with query parameters
src/DataSource.php	Added new read-only properties and overridden retrieve()/get() methods to accept query parameters instead of using GetTrait
tests/Unit/DataSourceTest.php	Added comprehensive test suite covering all DataSource operations including the new query parameter functionality
README.md	Updated documentation with examples showing how to use the new query parameters

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