Revert "Update gitignore"

This reverts commit 4f2b4a4.

.gitignore

@@ -1,14 +1,2 @@
-# Ignore all bazel-* symlinks. There is no full list since this can change
-# based on the name of the directory bazel is cloned into.
-/bazel-*
-
-# Build Artifacts
-build/
-dist/
-*.egg-info/
-*__pycache__/
-metadata_store_extension.so
-
-# Compiled grpc/protobuf files
-*_pb2.py
-*_pb2_grpc.py
+# Ignore bazel target dirs
+bazel-*