Add feature to generate manifest.json for TCI

[jaybaws]

The maven plugin is able to generate the .ear file without a full BWCE/BusinessStudio installation present.

However, generating a manifest.json is only possible when bwdesign is present. This means we need to run our builds within very large (2+ Gb) containers, which slows the build process down significantly.

Would it be possible to add capability to generate manifest.json (for TCI deployments) to the plugin natively, without the need for bwdesign?