[hyperactor] HostMesh::fork; port 'dining philosophers' to v1 #1660
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Stack from ghstack (oldest at bottom):
HostMesh::fork provides a way to create a singleton host mesh from the current process. The process itself becomes the host manager, spawning procs using the current command, reaching HostMesh::fork itself.
This allows us to easily create new host meshes for examples, testing, etc.
This is then used to port the 'dining philosophers' example to the v1 API.
Differential Revision: D85476026
NOTE FOR REVIEWERS: This PR has internal Meta-specific changes or comments, please review them on Phabricator!