[FEATURE REQUEST] Improve secret version support on KV v2

[lkubb]

Is your feature request related to a problem? Please describe.
Currently, it's a bit cumbersome to e.g. delete/destroy the most recent version of a secret (one needs to specify the exact version to operate on). It's also really cumbersome to delete all versions of a secret.

Describe the solution you'd like
Improve support for version handling on KV v2:

• Automatically operate on the most recent version by default
• Have a switch that operates on all versions
• Support reading the relevant multi-version secret metadata (not the usual metadata that can be included in the request for a specific version)

Describe alternatives you've considered
None.

Additional context
Mostly exists, just needs tests.