azure keyvault techniques

[agroyz]

Two techniques: one related to Credential Access and the other to Privilege Escalation tactic. Both techniques pertain to Azure Key Vault and are covered under the sub-techniques of AZT604 in the Azure Threat Research Matrix.

Assign_keyvault_permissions: attempts to assign permissions for key vault; either RBAC or policy Dump_keyvalut: attempts to dump secrets, certificates, keys: AZT604.1, AZT604.2, AZT604.3