Inject tenant id into HTTP handlers or message handlers

[DurinMusicspear]

Is your feature request related to a problem? Please describe.
We work with non-Wolverine services and have to get/set tenant ID explicitly in many cases.

Describe the solution you'd like
It would be helpful if we could just inject string tenantId or have a special type TenantId that could be injected into HTTP and message handlers.

Describe alternatives you've considered
Getting tenantId from Envelope is fine for message handler, and using IQuerySession in HTTP handlers works. But its creates extra dependencies that we need to create or mock in the unit tests.