chore: Add a suitable devcontainer.json

[vorburger]

Primarily so that "it just works" (which it does not, without this, because of a Java version mismatch).

This would help me to contribute to this project more easily by making GitHub Codespaces to just work out of the box.

I've tried it and seen that this needed while trying to rebase #487 (and maybe #374).

@glaforge LGTM?

[gemini-code-assist]

Summary of Changes

Hello @vorburger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds a .devcontainer.json file to facilitate easier project contribution by providing a consistent and pre-configured development environment within GitHub Codespaces. It addresses Java versioning issues and sets up essential tools and extensions for Java development.

Highlights

• Devcontainer Setup: This PR introduces a .devcontainer.json file to streamline the development environment setup using GitHub Codespaces.
• Java Version Consistency: The primary motivation is to resolve Java version mismatches, ensuring a smoother 'it just works' experience for contributors.
• Dependency Management: The devcontainer configuration includes pre-installed extensions and settings tailored for Java development, enhancing the out-of-the-box experience.

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Changelog

• .devcontainer/devcontainer.json
  • Added a devcontainer configuration file to define the development environment.

Activity

• The PR aims to simplify the setup process for new contributors.
• It was created to address issues encountered while rebasing other pull requests.
• The author, vorburger, is seeking review and approval from glaforge.

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[gemini-code-assist]

Code Review

This pull request introduces a devcontainer.json file to standardize the development environment, which is a great addition for improving contributor experience, especially with GitHub Codespaces. The configuration correctly sets up a Java 17 environment, aligning with the project's requirements. I have a few suggestions to further refine the configuration for better performance, correctness, and usability: fixing a syntax error in the JSON, removing a potentially redundant VS Code extension, adjusting a build setting for faster builds, and adding a port forwarding rule to match the project's documentation.