Allow loading "foreign" plugins for UI/TUI/Serde

[gatesn]

This allows us to enable deserialization and re-serialization of unknown plugins by preserving their serialized metadata.

We cannot necessarily execute them in-memory, but it should be sufficient to traverse the expression trees. For arrays/layouts, we cannot construct the child trees without the vtable logic that derives the child dtypes, therefore a foreign encoding becomes a leaf node.

[codspeed]

Merging this PR will degrade performance by 15.22%

❌ 1 regressed benchmark
✅ 1121 untouched benchmarks
⏩ 1530 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_bool_canonical_into[(1000, 10)]	49.7 µs	58.6 µs	-15.22%

---

_{Comparing ngates/foreign (1f67281) with develop (ff21366)}

Footnotes

1. 1530 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[robert3005]

my only hesitation are foreign layouts but you can still traverse what you can from the layout