Add setters to the Id and Status properties of ResponseItem

[joseharriaga]

ResponseItem and its derived classes are both, inputs and outputs. As such, their properties must have setters.

[Copilot]

Pull request overview

This PR adds public setters to the Id property on ResponseItem and the Status properties on various ResponseItem subclasses to support their use in both input and output scenarios. Previously, these properties were read-only, but they need to be settable when constructing request objects for the OpenAI API.

• Added public setter to ResponseItem.Id property (changed from internal set)
• Added public setters to Status properties across 10 ResponseItem subclasses (changed from get-only)
• Updated CUSTOM comments to use consistent multi-line bullet-point format explaining the reasons for customizations

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Custom/Responses/Items/ResponseItem.cs	Changed Id property from internal set to public set to support optional input scenarios
src/Custom/Responses/Items/Message/MessageResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/Reasoning/ReasoningResponseItem.cs	Added public setter to Status property, updated comment format, and minor line wrap formatting change
src/Custom/Responses/Items/Reference/ReferenceResponseItem.cs	Updated comment to clarify that Id is required in both input and output scenarios
src/Custom/Responses/Items/CodeInterpreterTool/CodeInterpreterCallResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/ComputerTool/ComputerCallResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/ComputerTool/ComputerCallOutputResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/FileSearchTool/FileSearchCallResponseItem.cs	Added public setter to Status property, updated comment format, and removed unused imports
src/Custom/Responses/Items/FunctionTool/FunctionCallResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/FunctionTool/FunctionCallOutputResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/ImageGenerationTool/ImageGenerationCallResponseItem.cs	Added public setter to Status property and updated comment format
src/Custom/Responses/Items/WebSearchTool/WebSearchCallResponseItem.cs	Added public setter to Status property and updated comment format
api/OpenAI.netstandard2.0.cs	Updated public API surface to reflect property setter changes
api/OpenAI.net8.0.cs	Updated public API surface to reflect property setter changes

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