feat: Add `StagehandCrawler` with AI-powered browser automation #541

Job	Run time
PR title check	5s
Code checks / Actions lint check	31s
Code checks / Spell check	6s
Doc checks / Doc checks / Docs check	1m 36s
Code checks / Type check / Type check (3.13)	34s
Code checks / Type check / Type check (3.14)	30s
Code checks / Lint check / Lint check (3.13)	32s
Code checks / Type check / Type check (3.12)	31s
Code checks / Type check / Type check (3.10)	28s
Code checks / Lint check / Lint check (3.11)	30s
Code checks / Lint check / Lint check (3.10)	34s
Code checks / Lint check / Lint check (3.14)	36s
Code checks / Lint check / Lint check (3.12)	32s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 25s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	6m 18s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 37s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	7m 10s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	4m 15s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	4m 39s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	4m 26s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 52s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 29s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 46s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	7m 10s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	4m 7s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 13s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	8m 35s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	6m 52s
Code checks / Type check / Type check (3.11)	29s
	1h 35m 28s

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