Use Meta networking lib (#75894)

[aivanou]

Summary: X-link: https://github.com/pytorch/pytorch/pull/75894

Move get_host_addr to separate module, and implement meta-internal get_host_addr that uses meta networking lib.

More info: https://docs.google.com/document/d/1paDoXWOy1ws2i1riFypJ3hpP6rO7cPwzTAHnH8OkPKY

Reviewed By: kiukchung, Babar

Differential Revision: D35288985

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This pull request was exported from Phabricator. Differential Revision: D35288985

[codecov[bot]]

Codecov Report

Merging #462 (d3efb89) into main (37c76eb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #462   +/-   ##
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  Coverage   94.59%   94.59%           
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  Files          65       65           
  Lines        3833     3833           
=======================================
  Hits         3626     3626           
  Misses        207      207           

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