feat: add std.objectRemoveKey

Upstream issue: google/go-jsonnet#686

crates/jrsonnet-stdlib/src/lib.rs

@@ -139,6 +139,7 @@ pub fn stdlib_uncached(settings: Rc<RefCell<Settings>>) -> ObjValue {
 		// Objects
 		("objectFieldsEx", builtin_object_fields_ex::INST),
 		("objectHasEx", builtin_object_has_ex::INST),
+		("objectRemoveKey", builtin_object_remove_key::INST),
 		// Manifest
 		("escapeStringJson", builtin_escape_string_json::INST),
 		("manifestJsonEx", builtin_manifest_json_ex::INST),

crates/jrsonnet-stdlib/src/objects.rs

@@ -1,9 +1,10 @@
 use jrsonnet_evaluator::{
 	function::builtin,
 	val::{StrValue, Val},
-	IStr, ObjValue,
+	IStr, ObjValue, ObjValueBuilder,
 };
 
+
 #[builtin]
 pub fn builtin_object_fields_ex(
 	obj: ObjValue,
@@ -27,3 +28,16 @@ pub fn builtin_object_fields_ex(
 pub fn builtin_object_has_ex(obj: ObjValue, fname: IStr, hidden: bool) -> bool {
 	obj.has_field_ex(fname, hidden)
 }
+
+#[builtin]
+pub fn builtin_object_remove_key(obj: ObjValue, key: IStr) -> ObjValue {
+	let mut new_obj = ObjValueBuilder::with_capacity(obj.len() - 1);
+	for (k, v) in obj.iter() {
+		if k == key {
+			continue
+		}
+		new_obj.member(k).value_unchecked(v.unwrap())
+	}
+
+	new_obj.build()
+}