add release workflow for publishing to RubyGems

[topherbullock]

Motivation and Context

closes:

• set up CD to deploy to RubyGems #1

How Has This Been Tested?

Follows a standard workflow pattern for publishing from GitHub using GH actions.
Steps are documented in the README.md

Breaking Changes

N/A

Types of changes

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

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

This repo will be added as a Trusted Publisher, once the workflow is merged. https://guides.rubygems.org/trusted-publishing/adding-a-publisher/#:~:text=Adding%20a%20trusted%20publisher%20to%20a%20gem%20only%20requires%20a,Click%20that%20link.