Fix large integer queries

Summary

This MR does two things:

• Fix https://gitlab.com/caosdb/caosdb-server/-/issues/145
• Expose some internals of POV.java for unittests.

Please merge together with caosdb-pyinttest!35 (merged)

Focus

• Was the cast to integer necessary before?
• Was the required dot in Doubles necessary before?

Test Environment

Unit tests, integration tests.

Check List for the Author

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• All automated tests pass
• Reference related issues #239 (closed)
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• Annotations in code (Gitlab comments)
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  • Problems with old code
  • Why this implementation?

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• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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