Move command palette filter into collections crate

Filter out copilot commands from command palette when not active

crates/collections/src/collections.rs

@@ -24,3 +24,10 @@ pub type HashMap<K, V> = std::collections::HashMap<K, V>;
 pub type HashSet<T> = std::collections::HashSet<T>;
 
 pub use std::collections::*;
+
+// NEW TYPES
+
+#[derive(Default)]
+pub struct CommandPaletteFilter {
+    pub filtered_namespaces: HashSet<&'static str>,
+}