feat: Add support for MiniStack

[mwilde]

What does this PR do?

Adds a new \Testcontainers.MiniStack\ module — a Testcontainers integration for MiniStack, a free open-source AWS emulator.

The module follows the same structure as the existing \Testcontainers.LocalStack\ module and includes:

• \MiniStackBuilder\ — fluent builder with port binding, health check on /_ministack/health, and image default \ministackorg/ministack:latest\
• \MiniStackConfiguration\ — immutable container configuration
• \MiniStackContainer\ — container with:
  • \GetConnectionString()\ — returns the \http://host:port\ endpoint
  • \ResetAsync(bool runInitScripts, CancellationToken)\ — wipes all service state via /_ministack/reset; optionally re-runs init scripts with ?init=1\
  • \GetSesMessagesAsync(CancellationToken)\ — inspects SES emails without consuming them
  • \GetSqsMessagesAsync(CancellationToken)\ — inspects SQS messages without consuming them
• Full test coverage: CloudWatch, DynamoDB, S3, SNS, SQS, reset, SES inspection, SQS inspection

Why is it important?

LocalStack moved its core services behind a paid plan. MiniStack is a MIT-licensed, drop-in compatible alternative that emulates 60+ AWS services on port 4566 with no account, API key, or sign-up required. Having first-class Testcontainers support makes it easy for teams to adopt MiniStack in their .NET test suites.

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