Add missing transit commands, export commands object, fix commands TypeScript type

[Copilot]

Issue #198 reported missing rewrap and keys transit endpoints, no way to access the built-in commands object for extension, and an incorrect TypeScript type for the commands config option (Array<...> instead of an object map).

New transit commands

• rewrapData — POST /transit/rewrap/{{name}}
• transitCreateKey — POST /transit/keys/{{name}}
• transitReadKey — GET /transit/keys/{{name}}
• transitListKeys — LIST /transit/keys
• transitDeleteKey — DELETE /transit/keys/{{name}}

Export commands for extensibility

client.commands now exposes the commands object, so users can inspect or extend it without importing src/commands.js directly.

Fix TypeScript types

- commands?: Array<{ method: string, path: string, scheme: any }>;
+ commands?: { [name: string]: functionConf };

Added commands property and all new method signatures to the client interface.

Usage

const vault = require('node-vault')();

// Rewrap ciphertext under the latest key version
await vault.rewrapData({ name: 'my-key', ciphertext: 'vault:v1:...' });

// List transit keys
await vault.transitListKeys();

// Extend using the exported commands object
const cmds = vault.commands;
vault.generateFunction('myCustomCmd', { method: 'POST', path: '/custom/path' });

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