Adding more general code generation datasest

[niansong1996]

We would like to add more general code generation datasets for evaluation:

• ARCADE
• DS-1000
• CodeContest

Though we already have Python program executors, we still need to adapt to some of the new datasets.

[rays1024]

For CodeContest's requirement, unable to install bazel on the server. It uses apt install.

[rays1024]

Also working on preprocessing DS-1000 into jsonl file

[niansong1996]

Assigning this also to @yilunzhao for CodeContest

[niansong1996]

We are adding DS-1000 in #44 and HumanEval in #51