[Distributed] Move into torchchat folder

[kwen2501]

Moved distributed folder into torchchat folder.

dist_run.py unfortunately have to stay at root a bit longer till either of the following happens:
(i) we support pip install of torchchat (needs a pyproject.toml) or
(ii) we refactor dist_run.py as a "main" backend callable by torchchat.py, like:

torchchat/torchchat.py

Lines 79 to 92 in 0b8ca05

	elif args.command == "generate":
	check_args(args, "generate")
	from torchchat.generate import main as generate_main
	generate_main(args)
	elif args.command == "eval":
	from torchchat.usages.eval import main as eval_main
	eval_main(args)
	elif args.command == "export":
	check_args(args, "export")
	from torchchat.export import main as export_main
	export_main(args)

Item (ii) should be on our agenda.

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[lessw2020]

ouch...lol.

[lessw2020]

I'd prefer to leave this file in for now.

[lessw2020]

looks good!
I would still like to keep the run_dist.sh as I use it a lot.
Thanks for moving us into the right long term location.