* feat: persisting retention options in repository blob
- plumb retention parameters through wrapped storage
- generalize aes encryption mechanism
- rewrite the retention blob on password change
- do not write retention blob when empty
* handle retention-blob not-found failures
* cli params to set retention modes on repository create
* enable versioned map mock storage with retention settings
* adding unit tests
* write format and retention blob with retention settings if available
* rename certain functions and constants specific to format blob
* delete retention cache on password-change
* fix: replace SetTime() api call with TouchBlob()
* Update repo/repository_test.go
Co-authored-by: Nick <nick@kasten.io>
* pr feedback and codecov improvements
* fix: rename retention-blob structures to generic blob-cfg
* fix: remove minio dependency on retention constants
Co-authored-by: Shikhar Mall <shikhar@kasten.io>
Co-authored-by: Nick <nick@kasten.io>