[dotnet] [bidi] Add image size to capture screenshots

[nvborisenko]

https://w3c.github.io/webdriver-bidi/#command-browsingContext-captureScreenshot

New imageSize optional parameter.

💥 What does this PR do?

This pull request enhances the screenshot capturing functionality in the BiDi WebDriver by allowing callers to specify a maximum image size for screenshots. The changes introduce a new ImageSize option and update the relevant data structures and method signatures to support this feature.

Screenshot capture enhancements:

• Added an optional ImageSize property to the CaptureScreenshotOptions record, allowing users to specify MaxWidth and MaxHeight for screenshots. [1] [2]
• Updated the CaptureScreenshotParameters record and the CaptureScreenshotAsync method to accept and pass through the new ImageSize parameter. [1] [2]

🤖 AI assistance

• No substantial AI assistance used
• AI assisted (complete below)
  • Tool(s):
  • What was generated:
  • I reviewed all AI output and can explain the change

💡 Additional Considerations

🔄 Types of changes

• Cleanup (formatting, renaming)
• Bug fix (backwards compatible)
• New feature (non-breaking change which adds functionality and tests!)
• Breaking change (fix or feature that would cause existing functionality to change)

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