feat: Pass extra configuration to json.dump()

[Rutam21]

Description

This PR addresses the need for customizable export configurations when using the await crawler.export_data("export.json") method.

Key Changes:

• Introduced a new option in the export_data method to accept additional keyword arguments, allowing users to pass configurations directly to json.dump() and other export functions.
• Created dedicated export helper methods for different formats in the BasicCrawler, including export_data_json and export_data_csv. This separation enhances clarity and maintainability while providing format-specific options.

This enhancement improves the flexibility of data exports, enabling users to tailor their export settings to meet specific requirements.

Issues

Fixes #526

Testing

Unit test cases are added to check the updated configuration and functionality.

Checklist

• CI passed

[Rutam21]

This PR is based on all the discussions in the parent issue and the suggestions thereafter. Please review and suggest changes, if any. Thank you.

cc: @vdusek @janbuchar

[vdusek]

Make sure the CI passes, see the CONTRIBUTING.md for more information.

[janbuchar]

The CI is still failing, can you please fix the issues?

[Rutam21]

@janbuchar I will push a commit to fix some of them by EOD.

[janbuchar]

@Rutam21 thank you for your initiative, but we decided to just fix up #580 on our own and merge that.