Add HarperDB Server

[jjohnson-hdb]

Adds official HarperDB server

Description

Server Details

Provides an interface for accessing data within HarperDB via Resources

Motivation and Context

Provides HarperDB clients the opportunity to leverage their data with LLMs

How Has This Been Tested?

Tested server functionality directly as well as with the use of Ollama

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update

Checklist

• [x] I have read the MCP Protocol Documentation
• [x] My changes follows MCP security best practices
• [x] I have updated the server's README accordingly
• [x] I have tested this with an LLM client
• [x] My code follows the repository's style guidelines
• [x] New and existing tests pass locally
• [x] I have added appropriate error handling
• [x] I have documented all environment variables and configuration options