Description

Add process to add and remove bpns from a user

Why

For better stability of the system the processes to add and remove bpns from a user the process has been made asynchronous

Issue

Refs: #1098

Checklist

• I have followed the contributing guidelines
• I have performed IP checks for added or updated 3rd party libraries
• I have created and linked IP issues or requested their creation by a committer
• I have performed a self-review of my own code
• I have successfully tested my changes locally
• I have added tests that prove my changes work
• I have checked that new and existing tests pass locally with my changes
• I have commented my code, particularly in hard-to-understand areas