KV v1 support

[kevkcc]

Describe the feature/enhancement
Can use KV v1 APIs as described here: https://developer.hashicorp.com/vault/api-docs/secret/kv/kv-v1

Expected behavior
Currently only KV v2 is supported I think, there are some differences in v2 appends a /data to the secret path: https://developer.hashicorp.com/vault/api-docs/secret/kv/kv-v2#read-secret-version

Additional context
Thanks for this library!

[rod-anami-kyndryl]

Yes, currently KV V2 is fully supported. I think there's no hurt in adding this previous version of KV.