Introduce multi-cursor inline transformations (#13368)

https://github.com/zed-industries/zed/assets/482957/591def34-e5c8-4402-9c6b-372cbca720c3

Release Notes:

- N/A

---------

Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/assistant/Cargo.toml

@@ -16,6 +16,7 @@ doctest = false
 anyhow.workspace = true
 anthropic = { workspace = true, features = ["schemars"] }
 assistant_slash_command.workspace = true
+async-watch.workspace = true
 cargo_toml.workspace = true
 chrono.workspace = true
 client.workspace = true