Missing dependencies in elegantrl/train/config.py and .../run.py *or* Incorrect calls from finrl/agents/elegantrl/models.py

**Describe the bug**

missing dependencies from running main.py --mode=test with elegantrl demo settings.

File "/usr/local/lib/python3.7/site-packages/finrl/main.py", line 149, in
raise SystemExit(main())
File "/usr/local/lib/python3.7/site-packages/finrl/main.py", line 81, in main
kwargs=kwargs,
File "/usr/local/lib/python3.7/site-packages/finrl/train.py", line 49, in train
from finrl.agents.elegantrl.models import DRLAgent as DRLAgent_erl
File "/usr/local/lib/python3.7/site-packages/finrl/agents/elegantrl/models.py", line 11, in
from elegantrl.train.config import Arguments

**==>** ImportError: cannot import name 'Arguments' from 'elegantrl.train.config' (/usr/local/lib/python3.7/site-packages/elegantrl/train/config.py)

list of missing modules:
from elegantrl.train.config import Arguments
from elegantrl.train.run import init_agent
from elegantrl.train.run import train_and_evaluate

A clear and concise description of what the bug is:

When running main.py in test mode, code executes until calling ...agents/elegantrl/models.py from train.py. ...agents/elegantrl/models.py calls elegantrl.train.config where many arguments and initializers exist, however the referenced imports do not exist and no function/method/class takes the correct parameters from the calls.

Line 84 in agents/elegantrl/models.py referenced call for train_and_evaluate: train_and_evaluate(model)
Line 92 in agents/elegantrl/models.py referenced call for Arguments: Arguments(agent_class, env)
Line 97 in agents/elegantrl/models.py referenced call for init_agent: init_agent(args, gpu_id)

**To Reproduce**
Steps to reproduce the behavior:
1. run main.py in test mode with elegantrl as the defined drl_lib (demo settings)
2. See error

**Expected behavior**
ppo analysis

**Desktop (please complete the following information):**
- OS: macOS Big Sur
- Browser: Chrome
- Version: 11.7.1 (20G918)

**Additional context**
No additional context to provide at this time