* pre-publish new signing keys for `rotation_period` of time before using
* Work In Progress: Prepublish JWKS and even cache control
* remove comments
* use math/rand instead of math/big
* update tests
* remove debug comment
* refactor cache control logic into func
* don't set expiry when create/update key
* update cachecontrol name in oidccache for test
* fix bug in periodicfunc test case
* add changelog
* remove confusing comment
* add logging and comments
* update change log from bug to improvement
Co-authored-by: Ian Ferguson <ian.ferguson@datadoghq.com>
John-Michael Faircloth