Logging & Error Handling improvements

[mkurapov]

Context

We do not log a whole lot of things right now, which makes it hard to debug. Furthermore, we want to make Rafiki ready to work with log management in the future. So let's add some logs!

More is more, we can always get rid of logs later. Add logs wherever you would want to see them.

Todos

• Standardize Open Payment errors #1905
• Add logs in graphql resolvers - backend #2575
• Add logs in graphql resolvers - auth #2574
• Add logs in Open Payments backend routes #2576
• Add logs in Auth routes #2577
• Add logs to ILP connector #2578
• Remove all errors with missing messages (throw new Error()) #2579
• Remove all console.log()s (if any) #2580
• Make sure every service defines logger.child({ service: 'SERVICE_NAME' }) #2581
• Explore and discuss options for log management tool #2582