Add initial implementation of evaluating changes generated by the assistant (#26799)

Release Notes:

- N/A

---------

Co-authored-by: Richard Feldman <oss@rtfeldman.com>
Co-authored-by: Thomas <thomas@zed.dev>

crates/assistant2/src/assistant.rs

@@ -31,8 +31,11 @@ use gpui::{actions, App};
 use prompt_store::PromptBuilder;
 use settings::Settings as _;
 
+pub use crate::active_thread::ActiveThread;
 pub use crate::assistant_panel::{AssistantPanel, ConcreteAssistantPanelDelegate};
 pub use crate::inline_assistant::InlineAssistant;
+pub use crate::thread::{Message, RequestKind, Thread, ThreadEvent};
+pub use crate::thread_store::ThreadStore;
 
 actions!(
     assistant2,