New Integration Component: CommunityToolkit.Aspire.Hosting.Mosquitto

[IgorShaposhnikov]

Closes #1519

This PR introduces a new hosting integration for Eclipse Mosquitto (CommunityToolkit.Aspire.Hosting.Mosquitto). It allows developers to seamlessly orchestrate and run an Eclipse Mosquitto MQTT broker inside a container as part of their .NET Aspire distributed application topology.

Overview of Changes

• Added CommunityToolkit.Aspire.Hosting.Mosquitto project to the toolkit.
• Implemented AddMosquitto extension method on IDistributedApplicationBuilder.
• Configured a TCP endpoint mapping to the default MQTT port 1883.
• Integrated a protocol-level health check to ensure the resource only reports healthy once it actively accepts TCP/MQTT traffic.
• Added support for data persistence (WithDataVolume and WithDataBindMount) and configuration overrides (mosquitto.conf).
• Added comprehensive unit/integration tests and XML documentation.

PR Checklist

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• PR doesn't include merge commits (always rebase on top of our main, if needed)
• New integration
• Docs are written
• Added description of major feature to project description for NuGet package
• Tests for the changes have been added (for bug fixes / features)
• Contains NO breaking changes
• Every new API (including internal ones) has full XML docs
• Code follows all style conventions

Other information

The implementation pins the eclipse-mosquitto image from docker.io to the stable, fully-versioned release tag 2.0.22 rather than using a floating tag, ensuring deterministic local builds for developers.

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/CommunityToolkit/Aspire/main/eng/scripts/dogfood-pr.sh | bash -s -- 1520

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/CommunityToolkit/Aspire/main/eng/scripts/dogfood-pr.ps1) } 1520"

[IgorShaposhnikov]

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