Implement H2O for long context inference on summarization tasks (#411)

.github/scripts/spellcheck_conf/wordlist.txt

recipes/experimental/long-context/H2O/README.md

...l/long-context/H2O/data/summarization/cnn_dailymail.jsonl

...perimental/long-context/H2O/data/summarization/xsum.jsonl

recipes/experimental/long-context/H2O/requirements.txt

recipes/experimental/long-context/H2O/run_streaming.py

recipes/experimental/long-context/H2O/run_summarization.py

recipes/experimental/long-context/H2O/src/streaming.sh

recipes/experimental/long-context/H2O/utils/cache.py

recipes/experimental/long-context/H2O/utils/llama.py

recipes/experimental/long-context/H2O/utils/streaming.py