* Add auto_rotate_interval field to transit key creation path.
* Add auto_rotate_interval field to transit key config update path.
* Implement transit automatic key rotation on an hourly interval.
* Fixes transit key autorotation key listing typo.
* Add unit tests for transit key autorotation.
* Add unit tests for transit key creation with autorotation interval.
* Add unit tests for transit key config update with autorotation interval.
* Document new auto_rotate_interval fields in key creation and key config update endpoints.
* Add changelog for transit key autorotation.
* Wrap individual transit key autorotation in a policy lock.
* Add a safeguard to transit key autorotation to ensure only one execution happens simultaneously.
This massively simplifies transit locking behavior by pushing some
locking down to the Policy level, and embedding either a local or global
lock in the Policy depending on whether caching is enabled or not.
* Start work on passing context to backends
* More work on passing context
* Unindent logical system
* Unindent token store
* Unindent passthrough
* Unindent cubbyhole
* Fix tests
* use requestContext in rollback and expiration managers
