New Key Vault opt to only allow certain IPs

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#### Description

Add the ability to restrict access to the key vault packer spins up by IP_Rules.

#### Use Case(s)

In my ENV we have policies that basically say don't allow "the world" access to KVTs. We have to use a predefined KVT for now, since packer wants to allow access to openly by default.

#### Potential configuration

A new config opt
```
build_key_vault_allowed_inbound_ip_addresses
```

#### Potential References

Start by locating the Azure Key Vault creation path and the configuration handling for the proposed build_key_vault_allowed_inbound_ip_addresses option. Check existing tests around Key Vault setup, then confirm that the configured IP rules are applied and covered by tests.

Written by the indexing model from the issue text.