Provide test coverage on hopr-server

[0xjjpa]

• [ ] Provide coverage using jest, and generate ready to use tap reports
• [ ] Integrate GitHub bot able to showcase coverage change in PRs
• [ ] Integrate GitHub action able to fail if coverage goes <x%, disable for now.

[0xjjpa]

Moving to Sprint 9.

[0xjjpa]

@nionis Can you check if you can install coveralls?

[nionis]

@jjperezaguinaga I can't, asked @SCBuergel to install it for me

[nionis]

After our meeting with @SCBuergel we decided to move this to Sprint 10 and focus on some other new issues