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* Fix: Align the Humaneval dataset with official results

Details:(1) modified the "doc_to_text" and "gen_prefix" in the "humaneval_instruct.yaml" file to make them the same as the Prompt in "meta-llama/Llama-3.1-70B-Instruct-evals".

(2) Change r.rfind("```") to r.find("```"), so it can locate the first "```", not the last one.

Results: Partially reproduced the official results: The result of LLaMA3.1-8B-Instruct is 66.5 (the official result is 72.6), and the result of LLaMA3.1-70B-Instruct is 80.5 (the official result is 80.5).

Ref: PR#2650

* add changelog and version

* add changelog

* add instruct humaneval

* nit

* add to readme

* nit

* add custom filter

* fix type casting of references

* add humaneval

* fix a bug in humaneval

* add greedy version of humaneval

* update tasks README

* test humaneval

* return multiple metrics

* nit

* add confirmation to run code tasks

* nit

* nit

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Co-authored-by: Hojin Lee <19949034+hjlee1371@users.noreply.github.com>
Co-authored-by: Baber <baber@hey.com>