Add EMR Serverless hybrid functionality

[saiadda02]

• Added EMR Serverless hybrid client support with emr-serverless-hybrid:// URL scheme
• Implemented EMRServerlessHybridClient for real-time S3 event log download and analysis
• Added EMRServerlessClient and EMRServerlessS3Client for AWS integration
• Added configuration support for emr_serverless_app_id and region parameters
• Added analysis tools and reports for production EMR Serverless job optimization
• Added multiple EMR configuration examples (hybrid, serverless, correct)

cr: https://code.amazon.com/reviews/CR-232997241

🔄 Pull Request

📝 Description

Brief description of changes and motivation.

🎯 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📖 Documentation update
• 🧪 Test improvement
• 🔧 Refactoring (no functional changes)

🧪 Testing

• ✅ All existing tests pass (task test)
• 🔬 Tested with MCP Inspector
• 📊 Tested with sample Spark data
• 🚀 Tested with real Spark History Server (if applicable)

🔬 Test Commands Run

# Example:
# task test
# npx @modelcontextprotocol/inspector uv run -m spark_history_mcp.core.main

🛠️ New Tools Added (if applicable)

• Tool Name: new_tool_name
• Purpose: What it does
• Usage: Example parameters

📸 Screenshots (if applicable)

✅ Checklist

• 🔍 Code follows project style guidelines
• 🧪 Added tests for new functionality
• 📖 Updated documentation (README, TESTING.md, etc.)
• 🔧 Pre-commit hooks pass
• 📝 Added entry to CHANGELOG.md (if significant change)

📚 Related Issues

Fixes #(issue number)
Related to #(issue number)

🤔 Additional Context

---

🎉 Thank you for contributing! Your effort helps make Spark monitoring more intelligent.

[google-oss-prow]

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[nabuskey]

This PR is too big for us to review realistically. Please:

1. Remove unnecessary files.
2. Structure your files to follow the current repository structure.
3. State exactly what this does and expected end user workflows along with necessary IAM permissions.