[FEATURE] compare or diff view

### What's needed and why?

We need a compare or make a diff view to see what are the different between service custom field and global field ==> need to check if a service gets a custom or an old version of a global field which should be updated (i.e: CONTENT_SECURITY_POLICY)

or between two services

### Implementations ideas (optional)

Add a view next to "easy advanced raw" buttons

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct