* feat(kms): implement key management service with local and vault backends Signed-off-by: junxiang Mu <[email protected]> * feat(kms): enhance security with zeroize for sensitive data and improve key management Signed-off-by: junxiang Mu <[email protected]> * remove Hashi word Signed-off-by: junxiang Mu <[email protected]> * refactor: remove unused request structs from kms handlers Signed-off-by: junxiang Mu <[email protected]> --------- Signed-off-by: junxiang Mu <[email protected]>