Add EfficientDiD estimator (Chen, Sant'Anna & Xie 2025) #339

Job	Run time
Pure Python Fallback	50m 45s
Rust Unit Tests (macos-latest)	1m 34s
Rust Unit Tests (ubuntu-latest)	1m 13s
Rust Unit Tests (windows-latest)	2m 14s
Python Tests (macos-latest, py3.11)	5m 7s
Python Tests (ubuntu-latest, py3.13)	9m 29s
Python Tests (windows-latest, py3.13)	10m 1s
Python Tests (macos-latest, py3.13)	5m 9s
Python Tests (ubuntu-latest, py3.11)	9m 2s
Python Tests (windows-latest, py3.11)	8m 37s
	1h 43m 11s

Provide feedback