feat: Add NATS module

[niklasfp]

What does this PR do?

This pr adds support for the official Nats Server image It should roughly align with the Go version providing support for .WithUsername and .WithPassword

The container enables the http monitoring endpoints of Nats, and exposes the default Nats server ports:

• Client port 4222
• Http monitoring endpoints on port 8222
• Routes on port 6222

It also adds methods for getting a Nats connection string and the url for the monitoring endpoint.

Why is it important?

I needed it for my own work, and thought I might as well share it. And since Nats already has both Go and Node.js implementations, I guess others would benefit as well.

Related issues

N/A

How to test this PR

Tests has been added in this pr. Run the tests in ./tests/Testcontainers.Nats.Tests

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[niklasfp]

@HofmeisterAn How should we handle this, you can rebase and merge if you see it fitting, or let me know what you need done from me 😄

[HofmeisterAn]

@HofmeisterAn How should we handle this, you can rebase and merge if you see it fitting, or let me know what you need done from me 😄

Ah, perhaps I misinterpreted it. I thought you were going to make changes according to the suggestion.

I'll ditch the null checks.

I am fine with the pull request; it looks good 👍, thanks! I can merge it later today when I am back home. Rebase, etc. is not necessary.

[niklasfp]

@HofmeisterAn cool!!