Add `List::sort()`, implement by merge sort

Add tests for `List::sort()`

Update vector, expand will move if noexcept

Update LIst, add comparetion operations

Update List, add `unique()`

Update List, add `reverse()`

Update List, add `remove()` and `remove_if()`

Update List, add `splice()`

Update List, add `merage()`

Update List, add `assign()`

Update List

Update List, add `operator=()`

Update List, add `resize()`

Fix a bug of `List::swap()`

Add test for `List::swap()`