Add caching for key endpoints that lookup keys by id / whoami endpoint

[Flo4604]

Currently when using the updateKey/updateCredits/setRoles/and others or whoami we run to the db each time to find the key and its information

This should be wrapped with our cache

• [ ] Add new cache into go/internal/services/caches/caches.go
• [ ] Use the cache in all handlers where we call this function
• [ ] Use the cache and pass it into the given handler(s) when
  • [ ] registering in the api start
  • [ ] in all tests

[linear[bot]]

ENG-2144

[Akhileshait]

hi @Flo4604 I would like to work on this issue.