Add support for context parallelism #1299
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Adds context parallelism with ring attention.
See WandB report for training runs to test correctness with a simple 410M config: https://wandb.ai/brandony/neox/reports/Test-context-parallelism-correctness--Vmlldzo5NTU4ODc1.
Based on this initial PR: #1266, with changes to get things working: