[FEATURE] Make X-Super-Client header required

[chatterchats]

What problem does it solve

It requires clients using the hosted version of the API to send along a X-Super-Client header that identifies their application, and optionally a X-Super-Contact header with developer contact info.

This allows us to identify applications and contact developers when implementing breaking changes or if their apps are causing problems.

What is the solution

Make the header required (after a grace period)

Existing alternatives

none

Added value

This allows us to identify applications and contact developers when implementing breaking changes or if their apps are causing problems.

Additional notes

Provide a way to disable this check for self-hosted containers

This is a direct reference and copy of dealloc's api issue #94 implementation, and will be following the implementation schedule in that repo as well.