refactor(deep-crawling): reorganize deep crawling strategies and add new implementations

Split deep crawling code into separate strategy files for better organization and maintainability. Added new BFF (Best First) and DFS crawling strategies. Introduced base strategy class and common types.

BREAKING CHANGE: Deep crawling implementation has been split into multiple files. Import paths for deep crawling strategies have changed.

crawl4ai/deep_crawling/crazy.py

@@ -1,12 +1,12 @@
 from __future__ import annotations
 # I just got crazy, trying to wrute K&R C but in Python. Right now I feel like I'm in a quantum state.
+# I probably won't use this; I just want to leave it here. A century later, the future human race will be like, "WTF?"
 
-# from typing import TYPE_CHECKING
+# ------ Imports That Will Make You Question Reality ------ #
 from functools import wraps
 from contextvars import ContextVar
 import inspect
 
-from httpx import get
 from crawl4ai import CacheMode
 from crawl4ai.async_configs import CrawlerRunConfig
 from crawl4ai.models import CrawlResult, TraversalStats