Make the fix_line_endings tool usable by consumers

tools/fix_line_endings/BUILD.bazel

@@ -0,0 +1,17 @@
+# Copyright 2025 Steven Le Rouzic
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+load("@rules_python//python:py_binary.bzl", "py_binary")
+
+package(
+    default_applicable_licenses = ["//:license"],
+)
+
+py_binary(
+    name = "fix_line_endings",
+    srcs = [
+        "fix_line_endings.py",
+    ],
+    visibility = ["//visibility:public"],
+)