feat(continuous-did): covariate support (reg + dr) under conditional parallel trends #2641

Job	Run time
Pure Python Fallback	1h 26m 21s
Rust Unit Tests (ubuntu-latest)	1m 25s
Rust Unit Tests (ubuntu-24.04-arm)	1m 24s
Rust Unit Tests (macos-latest)	1m 13s
Rust Unit Tests (windows-latest)	2m 14s
Python Tests (macos-latest, py3.13)	30m 16s
Python Tests (windows-latest, py3.11)	1h 0m 37s
Python Tests (ubuntu-latest, py3.13)	1h 4m 45s
Python Tests (macos-latest, py3.14)	33m 18s
Python Tests (ubuntu-24.04-arm, py3.11)	37m 3s
Python Tests (ubuntu-24.04-arm, py3.14)	34m 48s
Python Tests (ubuntu-latest, py3.14)	1h 5m 13s
Python Tests (windows-latest, py3.14)	1h 3m 59s
Python Tests (ubuntu-24.04-arm, py3.13)	34m 56s
Python Tests (windows-latest, py3.13)	57m 5s
Python Tests (ubuntu-latest, py3.11)	1h 4m 49s
Python Tests (macos-latest, py3.11)	33m 59s
	11h 13m 25s

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