Solve shared buffer in entities node

[oxixes]

Proposed changes

The entities node uses a shared buffer when buffering is enabled, which leads to nodes returning entities that were not requested and others not returning when multiple requests are processed at the same time.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Update only documentation, not any source code.
• Maintain repository

Checklist

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• I have read the CONTRIBUTING doc
• I have signed the CLA
• I have updated the change log (CHANGELOG.md)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate) (not needed)
• Any dependent changes have been merged and published in downstream modules (none)

Further comments

This issue has been detected after using these nodes in a production environment with many requests happening at the same time, which lead to the described problem.

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