summary environment variables in AutoRound for ease-of-use

[xin3he]

Currently used environment variables:

environment_variables: dict[str, Callable[[], Any]] = {
    # this is used for configuring the default logging level
    "AR_LOG_LEVEL": lambda: os.getenv("AR_LOG_LEVEL", "INFO").upper(),
    "AR_ENABLE_COMPILE_PACKING": lambda: os.getenv("AR_ENABLE_COMPILE_PACKING", "0").lower() in ("1", "true", "yes"),
    "AR_USE_MODELSCOPE": lambda: os.getenv("AR_USE_MODELSCOPE", "False").lower() in ["1", "true"],
}

[xin3he]

@Yi4Liu Could you help add some doc for these environment variables?

[yiliu30]

@Yi4Liu Could you help add some doc for these environment variables?

Could you help me create a documentation page for environment variables, so the owner can add them as needed?

[xin3he]

Sure, I prepared a PR for environments and please review.
#1042