Add method to calculate embeddings for variable by distance aggregation #1241

Job	Run time
test (3.10, ubuntu-latest)	7m 47s
test (3.11, ubuntu-latest)	8m 21s
test (3.12, ubuntu-latest)	13m 12s
test (3.12, macos-latest, --pre, Python 3.12 (pre-release))	12m 47s
	42m 7s

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