Add integrator and child account support

[gogl92]

1️⃣ Yes, this is a direct user request to add support for PrintNode Integrator child accounts.

2️⃣ No, this PR contains a single, related change: adding support for PrintNode child account headers.

3️⃣ Tests are not included in this specific PR, but are planned for a follow-up.

4️⃣ This PR adds support for PrintNode Integrator child account headers within RequestOptions. This allows integrators to perform API calls on behalf of their child accounts by specifying the child account's ID, email, or creator reference. This functionality is crucial for managing child accounts as described in the PrintNode API documentation.

The following RequestOptions are now mapped to their respective PrintNode headers:

• child_account_id → X-Child-Account-By-Id
• child_account_email → X-Child-Account-By-Email
• child_account_creator_ref → X-Child-Account-By-CreatorRef

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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