Organize Java packages by feature not layer

[JirkaAichler]

Is your feature request related to a problem? Please describe. It is good practice to organize Java packages by feature not layer. Most of the API ML code base already follows this practice. However, some newer code (especially Cloud Gateway) organize packages by layer.

https://medium.com/expedia-group-tech/package-by-feature-not-by-layer-5ba04a070003

Describe the solution you'd like

• Reorganize Cloud Gateway packages by feature
• Update contributing guidelines with this information

I would not touch other services at the moment. We can improve them in the future when working on them.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.