Simplify OSGi manifest generation

[denis-anisimov]

This issue is a copy of the similar issue in FW:
vaadin/framework#8830

OSGi manifests (imports, exports, ...) should be generated in a way that is reliable and maintainable to avoid accidentally breaking OSGi support.

This can be done e.g. with the bnd Maven plug-in using exclusions rather than explicit inclusions as the primary configuration mechanism.

Related commit is mmerruko/framework@8d105fd