Refactor adaptive crawling state management

- Renamed `CrawlState` to `AdaptiveCrawlResult` to better reflect its purpose.
- Updated all references to `CrawlState` in the codebase, including method signatures and documentation.
- Modified the `AdaptiveCrawler` class to initialize and manage the new `AdaptiveCrawlResult` state.
- Adjusted example strategies and documentation to align with the new state class.
- Ensured all tests are updated to use `AdaptiveCrawlResult` instead of `CrawlState`.

tests/adaptive/test_embedding_strategy.py

@@ -20,7 +20,7 @@ from crawl4ai import (
     AsyncWebCrawler,
     AdaptiveCrawler,
     AdaptiveConfig,
-    CrawlState
+    AdaptiveCrawlResult
 )
 
 console = Console()