Add Staggered Triple Difference estimator #685

Job	Run time
Pure Python Fallback	1h 0m 48s
Rust Unit Tests (windows-latest)	2m 28s
Python Tests (macos-latest, py3.11)	18m 40s
Python Tests (windows-latest, py3.11)	36m 33s
Python Tests (ubuntu-latest, py3.13)	40m 35s
Python Tests (windows-latest, py3.13)	42m 25s
Python Tests (ubuntu-latest, py3.11)	38m 53s
Python Tests (ubuntu-24.04-arm, py3.13)	18m 57s
Rust Unit Tests (ubuntu-latest)	1m 19s
Rust Unit Tests (macos-latest)	1m 12s
Rust Unit Tests (ubuntu-24.04-arm)	2m 13s
Python Tests (macos-latest, py3.13)	18m 45s
Python Tests (ubuntu-24.04-arm, py3.11)	18m 32s
	5h 1m 20s

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