Update text cost extraction to use new graph extractor #15
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This PR is meant to try using the new graph based extractor and custom cost model added to egglog in egraphs-good/egglog-python#357. It was developed in tandem with that PR to help drive the interface.
I only updated the specific extraction tests, but didn't start looking at how to update the actual extraction interface within the larger system yet, or run any larger tests.
The extraction algorithm also may not be the same, it should be equivalent to https://github.com/egraphs-good/extraction-gym/blob/main/src/extract/greedy_dag.rs