refactor(root): remove direct slang dependency (#295)

Author: hongjr03

Cargo.toml

@@ -21,7 +21,6 @@ hir.workspace = true
 ide.workspace = true
 project-model.workspace = true
 syntax.workspace = true
-slang.workspace = true
 utils.workspace = true
 vfs.workspace = true
 

src/lib.rs

@@ -7,7 +7,6 @@ use const_format::formatcp;
 use itertools::Itertools;
 use lsp_server::Connection;
 use lsp_types::{MessageType, ShowMessageParams};
-use slang as _;
 use utils::{
     json::from_json,
     paths::{AbsPathBuf, patch_path_prefix},