[WIP] Rolling KV cache for autoregressive generation #12773
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What does this PR do?
Fixes #12600
Functionality-wise the self attention cache seems to work correctly, cross-attention has to be added and verfied. I added Krea to test the cache though I am not getting the same output as the original model yet. From quick debugging, looked to be related to timesteps or rope embeddings. Opening a draft as a reminder to myself to give this feature higher priority