feat: Enable using something other than Express for a web server

[joeyguerra]

Summary

I want to use a different web server - not Express. So I need a way for Hubot to load a different one.

• Default to Express so it doesn't break anyone else
• Implements an Express API for backwards compatibility
• Defines a HttpServerPort to extend
• To use, create a file that exports an asynchronous function that returns an instance of HttpServerPort. Checkout the ExpressHttpServerPort for reference.

[Copilot]

Pull request overview

This PR introduces a plugin architecture for HTTP servers in Hubot, allowing developers to use alternatives to Express. The implementation adds a base HttpServerPort class that defines the HTTP server interface, and refactors the existing Express integration into an ExpressHttpServerPort adapter.

Key changes:

• Introduces HttpServerPort base class with stub implementations of HTTP server methods
• Creates ExpressHttpServerPort as the default Express implementation
• Refactors Robot constructor to accept a server factory function instead of a boolean
• Adds CLI option --httpdserver to specify custom HTTP server modules

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
src/ports/HttpServerPort.mjs	New base class defining the HTTP server port interface with stub methods
src/ports/ExpressHttpServerPort.mjs	Express implementation of HttpServerPort with configuration via environment variables
src/Robot.mjs	Refactored to use server factory pattern and converted setupExpress to static method
bin/Hubot.mjs	Added CLI option and logic to load custom HTTP server modules
test/contracts/HttpServer_test.mjs	New contract tests for HttpServerPort API
test/Robot_test.mjs	Added test for non-Express HTTP server (with missing implementation)
test/Hubot_test.mjs	Removed debug console.log statement

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