[stdlib] Extended Linked List cleanup and fixups

Minor tweaks, mostly consisting of removing unnecessary things like some
leftover debug prints and explicit type parameters. Also adds time
complexity information to all public methods of `LinkedList`.

Signed-off-by: Owen Hilyard <[email protected]>

stdlib/src/builtin/value.mojo

@@ -291,3 +291,41 @@ trait BoolableKeyElement(Boolable, KeyElement):
     """
 
     pass
+
+
+trait EqualityComparableWritableCollectionElement(
+    WritableCollectionElement, EqualityComparable
+):
+    """A trait that combines the CollectionElement, Writable and
+    EqualityComparable traits.
+
+    This trait requires types to implement CollectionElement, Writable and
+    EqualityComparable interfaces, allowing them to be used in collections,
+    compared, and written to output.
+    """
+
+    pass
+
+
+trait WritableCollectionElementNew(CollectionElementNew, Writable):
+    """A trait that combines the CollectionElement and Writable traits.
+
+    This trait requires types to implement both CollectionElement and Writable
+    interfaces, allowing them to be used in collections and written to output.
+    """
+
+    pass
+
+
+trait EqualityComparableWritableCollectionElementNew(
+    WritableCollectionElementNew, EqualityComparable
+):
+    """A trait that combines the CollectionElement, Writable and
+    EqualityComparable traits.
+
+    This trait requires types to implement CollectionElement, Writable and
+    EqualityComparable interfaces, allowing them to be used in collections,
+    compared, and written to output.
+    """
+
+    pass