Update contact addresses from @fb -> @meta

[16BitNarwhal]

Summary

change all contact info from @fb.com to @meta.com with grep
grep -rl "@fb.com" . | xargs sed -i 's/@fb.com/@meta.com/g'

fixes #1615

Test Plan

n/a

[facebook-github-bot]

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[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[Dcallies]

Sorry for the long delay in review, I've been totally underwater.

Nice job on coming up with an approach to comprehensively find all the references!