VectorStoreIds in AssistantCreationOptions / FileSearchToolResources cannot be populated

[cpalm1974]

Service

OpenAI

Describe the bug

With the constructor of AssistantCreationOptions / FileSearchToolRessources it's not possible to ever set a value for VectorStoreIds.
Since the field is left uninitialized it's not possible to use the Add method and also a new List cannot be assigned since the set-method is declared as internal.

Steps to reproduce

1. See here:

AssistantCreationOptions options = new AssistantCreationOptions()
            {
                Name = "Test",
                Instructions = "Some instructions...",
                Tools = { ToolDefinition.CreateFileSearch(10) }
            };

options.ToolResources.FileSearch.VectorStoreIds.Add(myVectorStore.Id);

This compiles but throws an exception because "Add" requires a non-null Object on VectorStoreIds (which is missing in the constructor).

2. This would also be expected to be possible:

AssistantCreationOptions options = new AssistantCreationOptions()
{
    Name = "Test",
    Instructions = "Some instructions...",
    Tools = { ToolDefinition.CreateFileSearch(10) },
    ToolResources = new FileSearchToolResources() {
            VectorStoreIds = [myVectorStoreId],
        } 
};

This example doesn't compile because VectorStoreIds is read only because of being "inline".

Code snippets

No response

OS

Windows 11

.NET version

8.0

Library version

2.1.0