chore: move cli under lerna package

[ematipico]

What kind of change does this PR introduce?

Refactor. This PR moves the cli code under a lerna package. This will help the symlinks between different packages and it will help the release process.

Did you add tests for your changes?
No. Tests should all pass after this refactor.

If relevant, did you update the documentation?
No. It should be done in later commits.

Summary
The cli should be under the lerna supervision. This is useful because it will help the creation of changelog, tagging, committing and publishing using one single tool.

Also, I changed the way the serve package retrieves the arguments from the CLI. Instead of referring with a relative path, it now import webpack-cli package (note the change in package.json of the cli):

"main": "./lib/webpack-cli.js"

And it exposes a getter (getCoreFlags) that are passed to the serve command.

Moved to yarn. It's essential to use the workspaces features so we can link locally all the packages together and we can test them seamlessly!

Does this PR introduce a breaking change?

It should not.

Other information

[webpack-bot]

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[rishabh3112]

Looks great, but have left some suggestions.
Instead of naming sub package "webpack-cli" we should call it "@webpack-cli/core" as it will go good with the conventional naming of sub packages. Like @babel/cli, @webpack-cli/core, etc.

Also we should keep bin in the main package itself and spawn cli from "core" sub package.

[ematipico]

@rishabh3112

Instead of naming sub package "webpack-cli" we should call it "@webpack-cli/core" as it will go good with the conventional naming of sub packages. Like @babel/cli, @webpack-cli/core, etc.

We still need a package called webpack-cli because that's what we are going to publish and that's what the users are installing (npm i -D webpack-cli). We could have a core package but we still need the webpack-cli one.

Also we should keep bin in the main package itself and spawn cli from "core" sub package.

The main package won't be published on the registry (it has to be private). The cli folder (I will rename it webpack-cli in my next PR) is the actual CLI and that's where the binary has to be defined.

[ghost]

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Happy coding!

[webpack-bot]

@ematipico Thanks for your update.

I labeled the Pull Request so reviewers will review it again.

@jamesgeorge007 Please review the new changes.

[anshumanv]

This is superb, makes it way easy to setup the project now that it leverages yarn workspaces. Kudos! 🎉