Integration tests for client-side caching.

Summary

See caosdb-pylib!100 (merged) for a description: Client-side caching

Focus

• Full coverage?

Test Environment

As usual, simply start a server, then call

pytest tests/test_pylib_caching.py

Check List for the Author

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• All automated tests pass
• Reference related issues
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• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
  • How do I use the software? Assume "stupid" users.
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  • Problems with old code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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For further good practices have a look at our review guidelines.