Phase 4: Survey support for ImputationDiD, TwoStageDiD, CallawaySantAnna #555

Job	Run time
Python Tests (ubuntu-latest, py3.13)	39m 37s
Python Tests (ubuntu-24.04-arm, py3.11)	17m 29s
Python Tests (windows-latest, py3.11)	39m 47s
Python Tests (macos-latest, py3.13)	18m 11s
Rust Unit Tests (ubuntu-latest)	1m 17s
Python Tests (macos-latest, py3.11)	16m 55s
Python Tests (ubuntu-24.04-arm, py3.13)	17m 48s
Rust Unit Tests (macos-latest)	1m 22s
Python Tests (windows-latest, py3.13)	35m 27s
Python Tests (ubuntu-latest, py3.11)	38m 30s
Pure Python Fallback	45m 49s
Rust Unit Tests (windows-latest)	2m 8s
Rust Unit Tests (ubuntu-24.04-arm)	1m 33s
	4h 35m 53s

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