feat: Add `StagehandCrawler` with AI-powered browser automation #533

Job	Run time
PR title check	5s
Code checks / Spell check	8s
Code checks / Actions lint check	32s
Doc checks / Doc checks / Docs check	1m 44s
Code checks / Lint check / Lint check (3.10)	30s
Code checks / Type check / Type check (3.10)	31s
Code checks / Lint check / Lint check (3.11)	26s
Code checks / Lint check / Lint check (3.13)	33s
Code checks / Lint check / Lint check (3.14)	36s
Code checks / Lint check / Lint check (3.12)	28s
Code checks / Type check / Type check (3.12)	34s
Code checks / Type check / Type check (3.13)	32s
Code checks / Type check / Type check (3.14)	33s
Code checks / Type check / Type check (3.11)	29s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 32s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 22s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	6m 26s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	3m 52s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	6m 2s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 38s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 37s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	6m 56s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	7m 56s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 57s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	5m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	6m 55s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	4m 9s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	6m 25s
	1h 34m 28s

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