[dotnet] [bidi] Support DestinationFolder optional arg in StartScreencast

[nvborisenko]

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

💥 What does this PR do?

This pull request updates the screencast functionality in the BrowsingContext module to support specifying a destination folder for screencast output. The main changes involve updating the parameters and options for starting a screencast.

Screencast destination folder support:

• Added a new DestinationFolder property to the StartScreencastOptions class, allowing users to specify where screencast files should be saved.
• Updated the StartScreencastParameters record to include the DestinationFolder parameter, and modified the StartScreencastAsync method to pass this value when starting a screencast. [1] [2]

🤖 AI assistance

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🔄 Types of changes

• New feature (non-breaking change)

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