Add ocr_options parameter and input validation to MultiModalConversation

[luk384090-cloud]

Description

[Describe what this PR does and why]

Related Issue: Fixes #[issue_number] or Relates to #[issue_number]

Security Considerations: [Check if API keys or sensitive credentials are exposed in code/logs]

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Refactoring

Component(s) Affected

• Model
• Application
• Common
• Documentation
• Tests
• CI/CD

Checklist

• Pre-commit hooks pass
• Tests pass locally
• Documentation updated (if needed)
• Ready for review

Testing

[How to test these changes]

Additional Notes

[Optional: any other context]

[gemini-code-assist]

Code Review

This pull request introduces an ocr_options parameter to the MultiModalConversation.call method and adds input validation to ensure that the input data is not empty before sending a request. The review feedback highlights that these changes (both the ocr_options parameter and the input validation block) are missing from the asynchronous counterpart AioMultiModalConversation.call, and recommends adding them there to maintain feature parity and consistent behavior.

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