improve sotarage and updates of RTs

internal/db/dbdefinition/dbdefinition.go

internal/db/dbrepo/supertokenrepo/supertoken.go

.../db/dbrepo/supertokenrepo/supertokenrepohelper/helpers.go

internal/endpoints/token/access/accessTokenEndpoint.go

internal/oidc/authcode/authcode.go

internal/oidc/refresh/refresh.go

shared/supertoken/superTokenHandler.go

shared/utils/cryptUtils/cryptUtils.go