feat: next major version

[snitin315]

What kind of change does this PR introduce?

Did you add tests for your changes?

If relevant, did you update the documentation?

Summary

Does this PR introduce a breaking change?

Other information

[snitin315]

I wIll use this branch to merge all changes for the next version. Then merge this PR at last.

[alexander-akait]

@snitin315 Can you list all remains todos and which packages we need to update it to have everything up to date

[alexander-akait]

@snitin315 can you rebase?

[snitin315]

@alexander-akait yes, for some reason I am unable to access github on my laptop.

[snitin315]

@alexander-akait Following TODOs are pending:

• webpack-cli/packages/webpack-cli/src/webpack-cli.ts

  Line 1949 in 9539ea1

  // TODO we should run webpack multiple times when the `--config` options have multiple values with `--merge`, need to solve for the next major release

• webpack-cli/test/serve/invalid-schema/invalid-schema.test.js

  Line 25 in 9539ea1

  // TODO need fix on webpack-dev-server side

I'm not sure what we need to do in 1st todo regarding --config, can you please explain?