Set up record-linkage experiment infrastructure

[zaneselvans]

We've got a bunch of (potential) experiments that we want to compare, so setting up a framework for running them all in repeatable way will be helpful

Tasks

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1. Switch to pulling nightly build DB from S3 rather than datasette (#41 )
2. #38 (#41)
3. #39 (#41)
4. Integrate splink matching model into pipeline #32
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5. Create KNN Cosine Similarity Function #48
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6. unpin pudl dependency from commit and use main once nightly builds are running on main
7. integrate utility name merge onto PPL into the PUDL plant_parts_eia analysis