Add doubly robust covariates path to EfficientDiD #487

Job	Run time
Rust Unit Tests (ubuntu-latest)	1m 21s
Python Tests (windows-latest, py3.13)	38m 41s
Pure Python Fallback	43m 9s
Rust Unit Tests (macos-latest)	1m 13s
Rust Unit Tests (windows-latest)	2m 33s
Rust Unit Tests (ubuntu-24.04-arm)	1m 29s
Python Tests (macos-latest, py3.11)	19m 32s
Python Tests (macos-latest, py3.13)	14m 18s
Python Tests (ubuntu-latest, py3.13)	39m 14s
Python Tests (ubuntu-latest, py3.11)	37m 46s
Python Tests (windows-latest, py3.11)	35m 18s
Python Tests (ubuntu-24.04-arm, py3.13)	18m 1s
Python Tests (ubuntu-24.04-arm, py3.11)	17m 46s
	4h 30m 21s

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