feat: Add `StagehandCrawler` with AI-powered browser automation #551

Job	Run time
PR title check	3s
Code checks / Actions lint check	53s
Code checks / Spell check	9s
Doc checks / Doc checks / Docs check	1m 48s
Code checks / Lint check / Lint check (3.13)	33s
Code checks / Lint check / Lint check (3.11)	33s
Code checks / Type check / Type check (3.12)	31s
Code checks / Lint check / Lint check (3.14)	34s
Code checks / Lint check / Lint check (3.12)	30s
Code checks / Lint check / Lint check (3.10)	34s
Code checks / Type check / Type check (3.13)	32s
Code checks / Type check / Type check (3.11)	29s
Code checks / Type check / Type check (3.14)	32s
Code checks / Type check / Type check (3.10)	29s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 54s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	5m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	8m 15s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 21s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 43s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	5m 48s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	6m 51s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 25s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	5m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 17s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	5m 50s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	6m 43s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	5m 28s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	6m 48s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 30s
	1h 36m 3s

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