Dev node in a rule

[bvdmitri]

This pull request introduces experimental functionality for custom nodes in RxInfer, allowing access to node objects within message passing rules. This feature is intended for advanced scenarios and comes with performance and global state considerations.

Key changes include:

Experimental Features

• Added a warning about the experimental nature of the new functionality and its potential changes in future releases.

Node Access in Rules

• Introduced the ability to pass node references to rules, enabling inspection of the current state of other variables, implementation of complex message passing schemes, and experimentation with custom inference algorithms.
• Provided an example of how to define a custom node and enable node reference passing for it.
• Demonstrated the use of the getnode() function to access the node object within a rule.

Performance and Global State Considerations

• Added notes on the performance impact and global state implications of enabling node reference passing, advising caution when using this feature in production code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.45%. Comparing base (10aa920) to head (713428b).
Report is 3 commits behind head on main.

Additional details and impacted files

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  Coverage   84.45%   84.45%           
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  Files          19       19           
  Lines        1525     1525           
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  Hits         1288     1288           
  Misses        237      237           

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