[4] move pt_operator_library to shared BUCK file (#80170)
Summary:
Move pt_operator_library to pt_ops.bzl and make it shared with OSS BUCK build
This will replace D36912042. I will update all load statements in future diffs.
Test Plan: sandcaslte, OSS CI
Differential Revision: D37390060
Pull Request resolved: https://github.com/pytorch/pytorch/pull/80170
Approved by: https://github.com/JacobSzwejbka
