feat(core): release version 0.5.0 with deep crawling and CLI

This major release adds deep crawling capabilities, memory-adaptive dispatcher,
multiple crawling strategies, Docker deployment, and a new CLI. It also includes
significant improvements to proxy handling, PDF processing, and LLM integration.

BREAKING CHANGES:
- Add memory-adaptive dispatcher as default for arun_many()
- Move max_depth to CrawlerRunConfig
- Replace ScrapingMode enum with strategy pattern
- Update BrowserContext API
- Make model fields optional with defaults
- Remove content_filter parameter from CrawlerRunConfig
- Remove synchronous WebCrawler and old CLI
- Update Docker deployment configuration
- Replace FastFilterChain with FilterChain
- Change license to Apache 2.0 with attribution clause

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