Benchmark Dictionary implementation in Swarm (#2191)

* add dictionary benchmarks _in Swarm language_
* add more tests
* fix discovered bugs

You can test it with:
```Haskell
run "example/recursive-containers.sw";
benchmark_tree
```

| Screenshot |
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| <img width="400" alt="Screenshot 2024-10-20 at 5 10 06 PM" src="https://github.com/user-attachments/assets/b9f8c832-43fb-4ebc-b1a7-4edfb54ebbb1"> | 



* Closes #2159