Feat/llm config (#724)

* feature: Add LlmConfig to easily configure and pass LLM configs to different strategies

* pulled in next branch and resolved conflicts

* feat: Add gemini and deepseek providers. Make ignore_cache in llm content filter to true by default to avoid confusions

* Refactor: Update LlmConfig in LLMExtractionStrategy class and deprecate old params

* updated tests, docs and readme

docs/examples/llm_extraction_openai_pricing.py

@@ -1,3 +1,4 @@
+from crawl4ai.async_configs import LlmConfig
 from crawl4ai.extraction_strategy import *
 from crawl4ai.crawler_strategy import *
 import asyncio
@@ -25,8 +26,7 @@ async def main():
             word_count_threshold=1,
             extraction_strategy=LLMExtractionStrategy(
                 # provider= "openai/gpt-4o", api_token = os.getenv('OPENAI_API_KEY'),
-                provider="groq/llama-3.1-70b-versatile",
-                api_token=os.getenv("GROQ_API_KEY"),
+                llmConfig=LlmConfig(provider="groq/llama-3.1-70b-versatile", api_token=os.getenv("GROQ_API_KEY")),
                 schema=OpenAIModelFee.model_json_schema(),
                 extraction_type="schema",
                 instruction="From the crawled content, extract all mentioned model names along with their "