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Expose generator_interned_weight() to Python (#1435)

* Expose generator_interned_weight() to Python

Split the interned tree cost calculation into two parts:
- interned_weight(): returns atom_bytes + 2*atoms + 3*pairs
- total_cost_from_tree(): interned_weight() * COST_PER_BYTE

The new generator_interned_weight() Python function deserializes a
generator program, interns the tree, and returns the raw weight.
Callers multiply by the COST_PER_BYTE consensus constant themselves,
avoiding a hardcoded multiplier on the Python side.

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