Provide all-in-one OSGi bundle for API and Core

[cziegeler]

If you want to use Apache Johnzon in an OSGi framework, it currently requires to install a bunch of bundles. It is not enough to just install the jakarata api bundle and Johnzon Core. This makes it unnecessary complicated. This simple module adds an all-in-one bundle which just contains the api and Johnzon Core. It overrides the SPI provider to avoid the need for additional bundles. The included SPI provider has also the benefit that it can use a hard coded provider instead of each time going through the service loader