feat: HSM support

[bgrieder]

The main goal of this PR is to add support for the Proteccio HSM.
It provides both

• the ability to perform the Create, Destroy, Export, Encrypt, and Decrypt operations on the HSM
• the ability to create keys in the KMS which are wrapped by a key in the HSM

This leads to significant refactoring of the database and encryption/decryption (wrap/unwrap) components to add flexibility for supporting additional hardware (or external software) in the future. In particular:

• the database components are now in a separate crate server_database. They are now split in 2 implementations: Objects store and Permissions store
• a new interfaces crate gathers interfaces to be implemented by new external components. Interfaces include:
  • Object Store
  • Permissions Store
  • Encryption Oracle

Key unique identifiers now support prefixes. Object Stores, Permissions stores, and Encryption Oracles can be registered against the prefixes.

Support for the Sensitive Attribute in addition to the ability to wrap a key by another key has been added to all keys creations

[Manuthor]

review in progress