FEAT: cdx:npm:package:bundled when flatten components

[jkowalleck]

Is your feature request related to a problem? Please describe.

This tool creates results that follow
https://github.com/CycloneDX/cyclonedx-property-taxonomy/blob/main/cdx/npm.md

when option --flatten-components=true is given, the property cdx:npm:package:bundled is missing.

flattening components and having bundled components should no longer be an issue, since #305 was done.

Describe the solution you'd like

If a NPM package was bundled, then add cdx:npm:package:bundled regardless of the CLI switch --flatten-components

Additional context

read https://github.com/CycloneDX/cyclonedx-node-npm/blob/main/docs/result.md