IOSuccess / IOFailure and match-case

I don't really see the point of `IOSuccess` and `IOFailure`. From one hand, `IOResult.from_value(1) == IOSuccess.from_value(1)`. Actually ,`IOSuccess.from_value(1) == IOFailure.from_value(1)`.
I would also expect some benefit when using it in a match-case. Something like:

```python
value = IOSuccess.from_value(1)
match value:
case IOSuccess(v): assert(v == 1)
case _: pass
```

However, the "correct" code is

```python
value = IOSuccess.from_value(1)
match value:
case IOResult(Success(v)): assert(v == 1)
case _: pass
```

Therefore, `IOSuccess` and `IOFailure` as aliases are quite confusing. Don't you think?

Start by locating the definitions of IOSuccess, IOFailure, IOResult, and Success, then reproduce both match-case examples and the equality comparisons from the issue. The intended behavior and whether these aliases should change are not decided here, so completion would require an agreed design and corresponding tests.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.