feat: Add Valyu Search & Extractor tools to Search-Research suite coupled with comprehensive documentation (docs)

[unicodevalyu]

This PR adds two new CrewAI tools powered by Valyu:

Valyu Search Tool

• Unified search interface via the Valyu Search API across web, academic, financial, and proprietary data sources
• Covers installation, configuration, and usage examples
• Details on query parameters (search type, relevance threshold, date ranges, source filters, response length, country code)

Valyu Extractor Tool

• Clean, structured content extraction from single or multiple URLs (up to 10) using the Valyu API
• Controls for extraction effort, response length, screenshots, and AI-powered summarization
• Full code samples showing basic and advanced extraction workflows
• These docs make it straightforward for agents to leverage Valyu's powerful search and content extraction capabilities.

I also added the full documentation in this PR as well!

---

Note

Adds Valyu-powered search and extraction capabilities and documents them.

• Introduces ValyuSearchTool and ValyuExtractorTool with sync/async APIs, config (response length, effort, filters), env var VALYU_API_KEY, and dependency on valyu
• Exposes new tools via crewai_tools/__init__.py and tools/__init__.py
• Adds comprehensive docs: new pages in "Search & Research" and updates tool catalog
• Includes unit tests for both tools covering init, parameter handling, result shaping/truncation, and async execution

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[unicodevalyu]

@lorenzejay Please help review, approve and merge. Many thanks 🙏

[unicodevalyu]

@tonykipkemboi Please review if you've got some time.