Use logging instead of print in RewritePass (#2835)

Makes it possible to filter this out using the regular logging mechanics
in Python.

Author: tgolsson

onnxscript/rewriter/__init__.py

@@ -2,6 +2,7 @@
 # Licensed under the MIT License.
 from __future__ import annotations
 
+import logging
 from typing import Sequence, TypeVar, Union
 
 __all__ = [
@@ -48,6 +49,8 @@
     _remove_optional_bias,
 )
 
+logger = logging.getLogger(__name__)
+
 _ModelProtoOrIr = TypeVar("_ModelProtoOrIr", onnx.ModelProto, ir.Model)
 _DEFAULT_REWRITE_RULES: tuple[pattern.RewriteRule, ...] = (
     *_no_op.rules,  # TODO: merge this rule into constant folding?
@@ -82,7 +85,8 @@ def __init__(
     def call(self, model: ir.Model) -> ir.passes.PassResult:
         count = self.rules.apply_to_model(model)
         if count:
-            print(f"Applied {count} of general pattern rewrite rules.")
+            logger.info("Applied %s of general pattern rewrite rules.", count)
+
         return ir.passes.PassResult(model, bool(count))