feat(browser): add standalone CDP browser launch and lxml extraction strategy

Add new features to enhance browser automation and HTML extraction:
- Add CDP browser launch capability with customizable ports and profiles
- Implement JsonLxmlExtractionStrategy for faster HTML parsing
- Add CLI command 'crwl cdp' for launching standalone CDP browsers
- Support connecting to external CDP browsers via URL
- Optimize selector caching and context-sensitive queries

BREAKING CHANGE: LLMConfig import path changed from crawl4ai.types to crawl4ai

tests/browser/test_launch_standalone.py

@@ -0,0 +1,17 @@
+from crawl4ai.browser_profiler import BrowserProfiler
+import asyncio
+
+
+if __name__ == "__main__":
+    # Test launching a standalone browser
+    async def test_standalone_browser():
+        profiler = BrowserProfiler()
+        cdp_url = await profiler.launch_standalone_browser(
+            browser_type="chromium",
+            user_data_dir="~/.crawl4ai/browser_profile/test-browser-data",
+            debugging_port=9222,
+            headless=False
+        )
+        print(f"CDP URL: {cdp_url}")
+
+    asyncio.run(test_standalone_browser())