Lint service arguments

[Akryum]

What problem does this feature solve?

The user should be able to pass additional arguments to eslint when running the vue-cli-service lint command.

What does the proposed API look like?

yarn lint --ext .js,.vue,.gql

[dhensche]

The lint command uses the Engine API, which unfortunately does not have option name parity with the CLI. https://eslint.org/docs/developer-guide/nodejs-api#cliengine vs https://eslint.org/docs/user-guide/command-line-interface#options . I will look at creating a PR that renames and propagates the command line args to the engine api