Add KV v2 destroySecretVersions command

[Copilot]

Adds the missing KV v2 Destroy Secret Versions endpoint (POST /:mount/destroy/:path).

• src/commands.js — New destroySecretVersions command with configurable mount_point (defaults to secret) and schema-validated versions array
• index.d.ts — TypeScript declaration
• test/unit.js — Tests for default and custom mount point
• features.md — Regenerated

// Permanently destroy versions 1 and 2
await vault.destroySecretVersions({ path: 'my-secret', versions: [1, 2] });

// Custom mount point
await vault.destroySecretVersions({ mount_point: 'custom-kv', path: 'my-secret', versions: [3] });

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add support for KV v2 "destroy" command</issue_title>
<issue_description>https://developer.hashicorp.com/vault/api-docs/secret/kv/kv-v2#destroy-secret-versions

from what I saw in the commands, it's not available.
https://github.com/nodevault/node-vault/blob/master/src/commands.js</issue_description>

<agent_instructions>do the required research and implement</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@aviadhahami @intelline if you could PR this that'd be great :)

• Fixes Add support for KV v2 "destroy" command #240

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