Add Pyink formatting config to Bazel

This allows contributors to properly format Python code.

Closes #27762.

PiperOrigin-RevId: 840293027
Change-Id: Ib15173b4b072aa3fea98e7cd16b79f3fa5b0a75a

Author: fmeum

pyproject.toml

@@ -0,0 +1,16 @@
+# Python files in this repo are formatted with https://github.com/google/pyink.
+[tool.pyink]
+line-length = 80
+unstable = true
+target-version = []
+pyink-indentation = 2
+pyink-use-majority-quotes = true
+pyink-annotation-pragmas = [
+  "noqa",
+  "pylint:",
+  "type: ignore",
+  "pytype:",
+  "mypy:",
+  "pyright:",
+  "pyre-",
+]