Add integrator and child account support

[gogl92]

1️⃣ This PR addresses the need for PrintNode Integrator account support, specifically for managing child accounts, as requested by the user.

2️⃣ No, all changes are focused on adding PrintNode Integrator account and child account management.

3️⃣ Yes, a comprehensive test suite is included for the new AccountService.

4️⃣ This PR introduces full support for PrintNode Integrator accounts, enabling the management of child accounts. This is vital for applications that need to provision and manage PrintNode access for multiple end-users or customers. It provides a complete API for:

• CRUD operations for child accounts.
• Credit management for child accounts.
• State management (suspend/activate) for child accounts.
• API key and tag management for child accounts.

This functionality is essential for integrators building platforms that leverage PrintNode for their clients, allowing them to programmatically control and monitor their customers' PrintNode usage.

5️⃣ Thanks for contributing! 🙌

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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