Fix: Initialize originalInput in OperationParams

[tallesborges]

Summary

• Added initialization of $originalInput property in the init method of OperationParams class.
• This fix addresses the issue: "Typed property GraphQL\Server\OperationParams::$originalInput must not be accessed before initialization".
• The change ensures that $originalInput is properly set from the BaseOperationParams object during initialization.
• This prevents potential errors when accessing $originalInput and maintains consistency with other properties initialized in the init method.

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Type of change:

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] Misc. change (internal, infrastructure, maintenance, etc.)

Checklist:

• [X] Existing tests have been adapted and/or new tests have been added
• [ ] Add a CHANGELOG.md entry
• [ ] Update the README.md
• [X] Code style has been fixed via composer fix-style