Fix error in init town

[Monstertail]

Closes #

📑 Description

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed
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ℹ Additional Information

Test whether more relaxed mypy could reduce error during init-town here

[Monstertail]

With a relaxed setting of mypy, the captured error of "import" is reduced compared with PR here.
e.g. of the eliminated bugs:
line 19-20

research-town/env_paper_submission.py:2: error: Skipping analyzing ".agent_base": module is installed, but missing library stubs or py.typed marker [import-untyped]
research-town/env_paper_submission.py:3: error: Skipping analyzing ".env_base": module is installed, but missing library stubs or py.typed marker [import-untyped]

line 28-30:

research-town/utils.py:8: error: Cannot find implementation or library stub for module named "faiss" [import-not-found]
research-town/utils.py:10: error: Cannot find implementation or library stub for module named "torch" [import-not-found]
research-town/utils.py:14: error: Cannot find implementation or library stub for module named "arxiv" [import-not-found]

After "mypy" relaxation, the total number of bugs is reduced from 98 to 82.
The remaining 82 bugs usually are about type checking. e.g. error: Function is missing a type annotation.
Shall we relax the type checking of function defs/function calls?
@lwaekfjlk @ft2023

[lwaekfjlk]

Hi @ft2023 , Jinwei helps reduce some mypy errors and update the template. I think we can fix all these mypy error before mergin.