chore: Fix several style lints (#17488)

It's not comprehensive enough to start linting on `style` group, but
hey, it's a start.

Release Notes:

- N/A

crates/extension_api/src/extension_api.rs

@@ -182,7 +182,7 @@ static mut EXTENSION: Option<Box<dyn Extension>> = None;
 pub static ZED_API_VERSION: [u8; 6] = *include_bytes!(concat!(env!("OUT_DIR"), "/version_bytes"));
 
 mod wit {
-    #![allow(clippy::too_many_arguments)]
+    #![allow(clippy::too_many_arguments, clippy::missing_safety_doc)]
 
     wit_bindgen::generate!({
         skip: ["init-extension"],