Export flags for webpack-cli from webpack #10435

Feature request

We are looking to import the flags related to configuration from webpack.
webpack/webpack-cli#1241 has more information on this feature.

What is the expected behavior?
Have flags managed at the webpack itself

What is motivation or use case for adding/changing the behavior?
This feature was suggested by @sokra and @evilebottnawi

How should this be implemented in your opinion?
A real javascript object should be exported which will be utilized by the cli.
The flags should be in the form we have here https://github.com/webpack/webpack-cli/blob/next/packages/webpack-cli/lib/utils/cli-flags.js

Are you willing to work on this yourself?
yes. (@evilebottnawi is also willing to work on it)