chore: Remove unused imports and dead code causing compiler warnings

nvim-core/src/lib.rs

@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 use serde_json::{json, Value};
-use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader};
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct JsonRpcRequest {