* identity: Add batch entity deletion endpoint

* Update the parameter description

* Update error message

* Update helper/storagepacker/storagepacker.go
Co-Authored-By: Vishal Nayak <vishalnayak@users.noreply.github.com>

* Review feedback

* Update vault/identity_store_entities.go
Co-Authored-By: Calvin Leung Huang <cleung2010@gmail.com>
Co-authored-by: Vishal Nayak <vishalnayak@users.noreply.github.com>
Co-authored-by: Calvin Leung Huang <cleung2010@gmail.com>