ci: setup CI/CD workflow with release-please

[devakone]

Description

This PR sets up automated CI/CD workflows and release management for the MySQL MCP Server project.

Features Added

• GitHub Actions workflow for building and testing the project
• Automated release management using release-please
• NPM publishing automation when releases are created
• Better dependency caching for faster CI runs
• PR templates and issue templates for better community contributions
• Contribution guidelines and CI/CD documentation

Implementation Notes

• Uses release-please v4.2.0 for semantic versioning and changelog generation
• Configured to use Node.js 22.13.0
• Added necessary GitHub token permissions for release management
• Created comprehensive contribution guidelines
• Added detailed CI/CD setup documentation