feat: add Priority to Nats queue

[ereali-aneo]

Motivation

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Description

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Testing

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Impact

[Discuss the impact of your modifications on ArmoniK. This might include effects on performance, configuration, documentation, new dependencies, or changes in behaviour.]

Additional Information

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Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• I have thoroughly tested my modifications and added tests when necessary.
• Tests pass locally and in the CI.
• I have assessed the performance impact of my modifications.