[MLIR][Python] Pass OpView subclasses instead of Operation in rewrite patterns (#163080)

This is a follow-up PR for #162699.

Currently, in the function where we define rewrite patterns, the `op` we
receive is of type `ir.Operation` rather than a specific `OpView` type
(such as `arith.AddIOp`). This means we can’t conveniently access
certain parts of the operation — for example, we need to use
`op.operands[0]` instead of `op.lhs`. The following example code
illustrates this situation.

```python
def to_muli(op, rewriter):
  # op is typed ir.Operation instead of arith.AddIOp
  pass

patterns.add(arith.AddIOp, to_muli)
```

In this PR, we convert the operation to its corresponding `OpView`
subclass before invoking the rewrite pattern callback, making it much
easier to write patterns.

---------

Co-authored-by: Maksim Levental <maksim.levental@gmail.com>

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