Access policies support for KV module

[jcframil]

Motivation

We need to add access policies support for the azure-kv module

Acceptance criteria

Requirements

• A vault can only have RBAC or access policies configuration
• An entity type for the different entities
  • Users
  • Security groups
  • Service principals
• A permission
  • key_permissions
  • secret_permissions
  • certificate_permissions
• At least one entity type as a requirement if access policies are defined
• At least one requirement between permissions if access policies are defined
• Datas to acquire the object_id of the different entities
• Requires for the datas
  • Display name: groups and service principals
  • User principal name: users
• Force error when enable_rbac_authorization: true and there are existing access policies

Values example

      access_policies:
        - entity_type: user | group | principal
           object_id: 3c2cd77b-8b97-46bc-837a-eac3b8841b3a
           display_name:  "test"
           key_permissions: ["Get", "List"]
           secret_permissions: []
           certificate_permissions: []

[jcframil]

Added in https://github.com/prefapp/tfm/pull/95