feat: Add `StagehandCrawler` with AI-powered browser automation #535

Job	Run time
PR title check	3s
Code checks / Spell check	6s
Code checks / Actions lint check	32s
Doc checks / Doc checks / Docs check	1m 36s
Code checks / Lint check / Lint check (3.11)	30s
Code checks / Type check / Type check (3.12)	32s
Code checks / Lint check / Lint check (3.13)	26s
Code checks / Lint check / Lint check (3.10)	31s
Code checks / Type check / Type check (3.13)	27s
Code checks / Type check / Type check (3.11)	30s
Code checks / Type check / Type check (3.14)	33s
Code checks / Lint check / Lint check (3.14)	27s
Code checks / Type check / Type check (3.10)	32s
Code checks / Lint check / Lint check (3.12)	32s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 56s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	7m 28s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 2s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	7m 50s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	6m 7s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	4m 26s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 47s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 4s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 52s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	5m 18s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	5m 28s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	7m 5s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 5s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	3m 58s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 41s
	1h 33m 24s

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