fix: unintended behavior for collections

crates/erg_compiler/lib/std/_erg_dict.py

@@ -0,0 +1,2 @@
+class Dict(dict):
+    pass

crates/erg_compiler/lib/std/_erg_set.py

@@ -0,0 +1,2 @@
+class Set(set):
+    pass

crates/erg_compiler/lib/std/_erg_std_prelude.py

@@ -14,6 +14,8 @@ from _erg_bool import Bool
 from _erg_bytes import Bytes
 from _erg_str import Str, StrMut
 from _erg_array import Array
+from _erg_dict import Dict
+from _erg_set import Set
 from _erg_in_operator import in_operator
 from _erg_mutate_operator import mutate_operator