Metadata embeddings

This release contains the OpenAI GPT parameter embeddings for parameters and variables from PolicyEngine UK and PolicyEngine US. The model used to embed the parameter metadata was sentence-transformers/all-MiniLM-L6-v2. This release is in two parts:

• metadata.csv.gz: one row per unique object, columns for name, country_id and type.
• embeddings.h5: an array of size (number of objects, embedding dimension)