Users and Authentication

What's Changed

• Add tests to the ´IntegrationMapper´ class by @Jenspetersen99 in #1
• Dont use maven wrapper, but installed maven in docker image by @JessicaTegner in #3
• Final Integration API prototype! by @ollioddi in #5
• Added user system by @JessicaTegner in #2
• Merge Auth2 to main - USER + AUTH domain by @ollioddi in #6

Full Changelog: https://github.com/Thomass1412/P3-BM-dashboard/commits/1.0