Add HazptrObserver
Summary: - Observer implementation backed by hazptrs - We were using TLObserver in a library our team maintains but were seeing global lock contention on process startup due to the TL https://fburl.com/scuba/offcpu/aud1qe8p (more details here https://fb.workplace.com/groups/wfi/permalink/5462384263810144/) - Also might be a perf win when compared with TLObserver when using getLocalSnapshot (per micro benchmarks / strobelights in D27535141) Reviewed By: yfeldblum Differential Revision: D27565756 fbshipit-source-id: f345a34c5fd2c69fde6b98f698f79640016f6eee
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