.NET: [Feature]: Add a session when initiating an agent conversation in DevUI.

[strikene]

Description

When conversing with an agent in DevUI and using a custom ChatHistoryProvider, the InvokedContext.Session in StoreChatHistoryAsync is always null, which is extremely inconvenient for debugging agents that require state storage.
Or is this happening because I missed some DevUI configuration, or is it that DevUI doesn't support this scenario natively?

Code Sample

Language/SDK

.NET