[MLIR][Python] enhance python api for tensor.empty (#103087)

Since we have extended `EmptyOp`, maybe we should also provide a
corresponding `tensor.empty` method. In the downstream usage, I tend to
use APIs with all lowercase letters to create ops, so having a
`tensor.empty` to replace the extended `tensor.EmptyOp` would keep my
code style consistent.

Author: xurui1995

mlir/python/mlir/dialects/tensor.py

@@ -13,6 +13,7 @@
 
 from typing import Sequence, Union
 from ._ods_common import _cext as _ods_cext
+from ._ods_common import get_op_result_or_op_results as _get_op_result_or_op_results
 
 
 @_ods_cext.register_operation(_Dialect, replace=True)
@@ -43,6 +44,18 @@ def __init__(
         super().__init__(result_type, dynamic_sizes, loc=loc, ip=ip)
 
 
+def empty(
+    sizes: Sequence[Union[int, Value]],
+    element_type: Type,
+    *,
+    loc=None,
+    ip=None,
+) -> _ods_cext.ir.Value:
+    return _get_op_result_or_op_results(
+        EmptyOp(sizes=sizes, element_type=element_type, loc=loc, ip=ip)
+    )
+
+
 generate = region_op(
     lambda result, dynamic_extents: GenerateOp(result, dynamic_extents),
     terminator=lambda args: YieldOp(args[0]),