Add doubly robust covariates path to EfficientDiD #481

Job	Run time
Pure Python Fallback	43m 5s
Rust Unit Tests (ubuntu-24.04-arm)	1m 28s
Rust Unit Tests (macos-latest)	1m 20s
Rust Unit Tests (windows-latest)	2m 6s
Rust Unit Tests (ubuntu-latest)	1m 23s
Python Tests (windows-latest, py3.13)	34m 49s
Python Tests (windows-latest, py3.11)	35m 16s
Python Tests (ubuntu-24.04-arm, py3.11)	17m 44s
Python Tests (ubuntu-latest, py3.11)	37m 47s
Python Tests (macos-latest, py3.13)	17m 13s
Python Tests (macos-latest, py3.11)	16m 53s
Python Tests (ubuntu-24.04-arm, py3.13)	17m 54s
Python Tests (ubuntu-latest, py3.13)	38m 33s
	4h 25m 31s

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