Potential Security Issue on Code Injection

In code [here](https://github.com/aiwaves-cn/agents/blob/350246d926c41728610fba73b7703c9d65b20567/src/agents/utils.py#L435), it `eval` an environment. A malicious local actor could set some values like `export FETSIZE='os.system("touch rickroll")'` to execute code.
This issue is similar to [CVE-2022-2054](https://huntr.com/bounties/ea4a842c-c48c-4aae-a599-3305125c63a7).