PB-2114: Add tracing

[msom]

Adds tracing for WSGI and management commands.

The following instrumentations can be enabled using a flag:

• Django
• Boto
• Psycopg
• Logging

[adk-swisstopo]

We looked into this with @ltflb-bgdi back in October and ISTR there was some complications to expect. I will need some time to reload context and figure out whether that's properly addressed but if you did look into this and have words to convince me it's all going to work fine under load and is properly supported, please write them down :)

[msom]

We looked into this with @ltflb-bgdi back in October and ISTR there was some complications to expect. I will need some time to reload context and figure out whether that's properly addressed but if you did look into this and have words to convince me it's all going to work fine under load and is properly supported, please write them down :)

I'm confident that it works as it's already done with service-control. Not confident that it will work under load, I will approach you regarding how to performance test this if that is ok for you?

[adk-swisstopo]

I think I was hoping to remove our custom monkey patching or switch to another web server before we get to this point as I suspect it might cause more weird interactions. Obviously we are not going to do that (at least not in time).

[KeeTraxx]

Looks fine to me, thanks!

[adk-swisstopo]

Not my favourite approach but if it works and you validate it with load testing, I guess it will do.

[msom]

Looks good at first glance, I'll merge it and test it some more on DEV and next week on INT.