feat(config-workspace-scopes): add config preset for npm and yarn workspaces

[janbiasi]

Description

Extract workspaces config into its own package.
Set the NPM constraint to 7+ as v7 introduced workspaces.

Motivation and Context

Please see the long explanation in #4262

Usage examples

// commitlint.config.js
module.exports = {
  extends: ['@commitlint/config-workspace-scopes']
};

echo "feat(nonexisting-pkg): your commit message here" | commitlint # fails
echo "feat(existing-pkg): your commit message here" | commitlint # passes

How Has This Been Tested?

Local test suite in the project based on the current lerna implementation

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

[escapedcat]

Thanks @janbiasi !