Make messaging endpoint path configurable

[heyitsaamir]

Summary

• Currently /api/messages is hardcoded as the messaging endpoint path. This might not be always what a developer wants.
• Adds messaging_endpoint option to AppOptions (defaults to /api/messages)
• App is the source of truth for the default; HttpServer requires it explicitly
• BotBuilderPlugin reads the path from http_server.messaging_endpoint instead of hardcoding

Port of microsoft/teams.ts#483

Test plan

• Existing test_http_server.py tests pass
• New test for default messaging endpoint value
• New test for custom messaging endpoint registration
• Manual test with a custom endpoint path

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR makes the Teams messaging endpoint path configurable across the Python SDK, replacing the previously hardcoded /api/messages route with an AppOptions.messaging_endpoint option (defaulting to /api/messages). This aligns the Python implementation with the referenced teams.ts change and ensures plugins (notably BotBuilder) follow the configured server route.

Changes:

• Added messaging_endpoint to AppOptions / InternalAppOptions with default /api/messages.
• Updated App to pass the configured messaging_endpoint into HttpServer.
• Updated HttpServer and BotBuilderPlugin route registration to use the configured endpoint; added tests for default/custom endpoints.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/botbuilder/src/microsoft_teams/botbuilder/botbuilder_plugin.py	Registers BotBuilder activity route using http_server.messaging_endpoint instead of hardcoding /api/messages.
packages/apps/tests/test_http_server.py	Adds tests for default and custom messaging endpoint registration behavior.
packages/apps/src/microsoft_teams/apps/options.py	Introduces messaging_endpoint option and internal default.
packages/apps/src/microsoft_teams/apps/http/http_server.py	Accepts/stores messaging_endpoint, exposes it via a property, and registers the route dynamically.
packages/apps/src/microsoft_teams/apps/app.py	Constructs HttpServer with the configured messaging endpoint and updates related comments.