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_performance.py

@@ -15,7 +15,7 @@ import os
 sys.path.append(str(Path(__file__).parent.parent.parent))
 
 from crawl4ai import AsyncWebCrawler, AdaptiveCrawler, AdaptiveConfig
-from crawl4ai.adaptive_crawler import EmbeddingStrategy, CrawlState
+from crawl4ai.adaptive_crawler import EmbeddingStrategy, AdaptiveCrawlResult
 from crawl4ai.models import CrawlResult
 
 
@@ -132,7 +132,7 @@ async def test_embedding_performance():
     strategy.config = config
     
     # Initialize state
-    state = CrawlState()
+    state = AdaptiveCrawlResult()
     state.query = "async await coroutines event loops tasks"
     
     # Start performance monitoring