ContextForge MCP Gateway

# 🧱 New Plugin ## 🔗 Closes _Link to the epic or parent issue:_ Closes # ## 🚀 Summary _Describe the new plugin_ ## 🧪 Checks - [ ] Plugin was [bootstrapped with the CLI](https://ibm.github.io/mcp-context-forge/using/plugins/lifecycle/) (native or external template) - [ ] Unit tests created for the new plugin - [ ] `make lint plugins` passes - [ ] `make test` passes - [ ] CHANGELOG updated (if user-facing) - [ ] README documentation was created for the plugin - [ ] New plugin added to the [documentation](https://ibm.github.io/mcp-context-forge/using/plugins/plugins/) linking to the README above