Function handle_document_change 

pub async fn handle_document_change(
    uri: Uri,
    content: String,
    state: Arc<ServerState>,
    client: Client,
    config: Arc<RwLock<DepsConfig>>,
) -> Result<JoinHandle<()>>

Generic document change handler using ecosystem registry.

Re-parses manifest when document content changes and spawns a debounced task to update diagnostics and request inlay hint refresh.