Support print_config

[Ezra-Yu]

Describe the feature

Motivation

1. It is inconvenient when checking whether a config is correct and knows the whole config context.
2. If I run an experiment, it is inconvenient to modify based on a prototype config.
3. There is a print_config.py in every sub-repo, it is simple. It should be enhanced.

mim print path/to/config.py

mim print url/to/config.py > xx.py -m [simple]

output

import xxx


###########  MODEL ########
xxxx

###########  DATASET ########
xxxx

Related resources

https://github.com/open-mmlab/mmpretrain/blob/main/tools/misc/print_config.py

Additional context
Add any other context or screenshots about the feature request here.
If you would like to implement the feature and create a PR, please leave a comment here and that would be much appreciated.