🏗️ Architect: Refactor ImednetSDK for Modularity

[fderuiter]

🏗️ Design Change:

• Extracted convenience methods from ImednetSDK to ImednetSDKConvenienceMixin in imednet/sdk_convenience.py.
• Moved endpoint registry to imednet/endpoints/registry.py to decouple configuration.
• Enforced strict return types (Dict[str, Any]) in Paginators.

♻️ DRY Gains:

• Reduced imednet/sdk.py size significantly, adhering to Single Responsibility Principle.

🛡️ Solidity:

• Improved type safety in pagination.
• Reduced "God Class" complexity of ImednetSDK.

⚠️ Breaking Changes:

• None to the public API. Users can still import ImednetSDK and use methods like get_studies exactly as before.

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PR created automatically by Jules for task 10359927914354068148 started by @fderuiter

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