Add integrator and child account support

[gogl92]

1️⃣ This feature was directly requested to add support for PrintNode Integrator accounts and child account management.

2️⃣ No, all changes are focused on adding Integrator/child account support.

3️⃣ Yes, new tests have been added for AccountService and RequestOptions to cover the new functionality.

4️⃣ This PR introduces comprehensive support for PrintNode Integrator accounts, enabling the management and impersonation of child accounts. This is crucial for applications that need to provision and control printing for multiple end-users or customers through a single Integrator account.

Key improvements include:

• Child Account Impersonation: Added child_account_by_id, child_account_by_email, and child_account_by_creator_ref options to RequestOptions, which translate to X-Child-Account-* headers. This allows any API request to be made on behalf of a specific child account.
• Account Management Service: A new AccountService has been implemented, providing methods for create, update, setState (e.g., suspend/activate), and delete child accounts.
• API Requestor Enhancements: The PrintNodeApiRequestor now supports PUT and PATCH HTTP methods, handles raw string bodies (specifically for setState), and correctly processes 204 No Content responses.
• Documentation: Updated docs/printnode/api.md with detailed usage examples for both impersonation and account management.

This functionality is essential for developers building platforms that integrate deeply with PrintNode and manage multiple client accounts.

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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