feat: SSE client example

[jpmcb]

Simple SSE client example using the GitHub MCP server.

[Copilot]

Pull request overview

This PR adds a new SSE (Server-Sent Events) client example that demonstrates how to connect to MCP servers using HTTP/SSE transport, specifically showcasing integration with the GitHub MCP server.

Key changes:

• New TypeScript-based client example using HTTPClientTransport for SSE connections
• Example demonstrates authentication, initialization, and tool calling with the GitHub MCP server
• Includes complete project setup with package configuration and documentation

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
examples/clients/sse/package.json	Defines package metadata, scripts, and dependencies for the SSE client example
examples/clients/sse/package-lock.json	Lock file ensuring consistent dependency versions
examples/clients/sse/tsconfig.json	TypeScript configuration for building the example
examples/clients/sse/src/index.ts	Main source code demonstrating SSE client connection and GitHub API interaction
examples/clients/sse/README.md	Documentation explaining the example purpose and usage instructions
examples/clients/sse/.gitignore	Git ignore configuration to exclude .env file

Files not reviewed (1)

• examples/clients/sse/package-lock.json: Language not supported

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