allow syncing with out-of-band changes for kv v1 and v2

[fairclothjm]

Description

Piggy backs on https://github.com/hashicorp/terraform-provider-vault/pull/2099 from @NightOwl998 to allow TFVP to sync out-of-band changes to kv secrets for v1 and v2.

Closes #2099 Closes #1993 Relates https://github.com/hashicorp/terraform-provider-vault/issues/1993

Checklist

• [x] Added CHANGELOG entry (only for user-facing changes)
• [x] Acceptance tests where run against all supported Vault Versions