Add OSGi manifest headers

[bdhoine]

The current build of the semantic-conventions-java project lacks the necessary OSGi manifest headers in its generated JAR files. This omission prevents the JARs from being used directly as OSGi bundles. To ensure compatibility and ease of integration with OSGi environments, it is important to include the appropriate OSGi headers in the manifest files of these JARs.

Adding these headers would significantly enhance the usability of this library in OSGi-based projects, allowing for seamless integration into environments that rely on modularity and dynamic loading of components. It would also align this project with best practices for Java library distribution in modular systems.

Proposed Solution

Modify the build configuration to automatically include the necessary OSGi headers in the manifest files of all JARs produced by this project.