Add integrator and child account support

[gogl92]

1️⃣ Is this something that is wanted/needed? Did you create an issue / discussion about it first?
Yes, this feature was directly requested by the user to add support for PrintNode Integrator accounts and child account management.

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.
No, all changes are focused on implementing PrintNode Integrator account and child account management.

3️⃣ Does it include tests, if possible? (Not a deal-breaker, just a nice-to-have)
Yes, comprehensive feature tests for the AccountService and unit tests for the Account resource have been added, along with test fixtures.

4️⃣ Please include a thorough description of the improvement and reasons why it's useful.
This PR introduces comprehensive support for PrintNode Integrator accounts, allowing programmatic management of child accounts.

Key improvements:

• New Account Resource: Represents PrintNode account data, including integrator-specific properties like canCreateSubAccounts, childAccounts, creatorRef, Tags, and ApiKeys.
• New AccountService: Provides a full suite of methods for:
  • Creating, retrieving, updating, and deleting child accounts.
  • Listing all child accounts and downloading detailed data.
  • Suspending and activating accounts.
  • Adding tags and generating API keys.
• Integration: Seamlessly integrated into the PrintNodeClient and ServiceFactory.
• Documentation & Examples: Detailed documentation (docs/printnode/account-management.md) and an example usage file (examples/account-management.php) are included.

Why it's useful:
This feature is crucial for businesses and platforms operating as PrintNode integrators. It enables the automation of child account provisioning, lifecycle management (suspension, activation), and organization through tagging, directly within the application. This significantly streamlines operations for managing multiple customer accounts.

5️⃣ Thanks for contributing! 🙌

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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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