Add Apache Pulsar Support to testcontainers-dotnet with Option for TokenAuthentication

[entvex]

What does this PR do?

This PR introduces Apache Pulsar support to testcontainers-dotnet, enabling users to easily spin up Pulsar containers for testing purposes. It also provides an option to enable TokenAuthentication, allowing for secure Pulsar interactions.

Why is it important?

Apache Pulsar is a rapidly growing distributed messaging system gaining traction in the cloud-native ecosystem. Integrating Pulsar support into testcontainers-dotnet will make it easier for developers to test their applications using Pulsar. Additionally, providing TokenAuthentication support enhances security and privacy in Pulsar-based testing scenarios.

How to test this PR

Run the XUnit tests in the testcontainers-dotnet project to ensure the Pulsar containerization and TokenAuthentication functionality work as expected.

Follow-ups

@HofmeisterAn, I encountered a challenge while adding WithTokenAuthentication capabilities to PulsarBuilder. The current implementation of WithCommand appends commands instead of replacing them, making it difficult to modify container startup commands based on selected Pulsar features. In the testcontainers-java module, the container command is modified just before the container starts, enabling control over its execution. Could you provide suggestions on how to achieve a similar approach in testcontainers-dotnet?

In the java module they seem to have the control to edit it, just before the container starts

Do you have a suggestion on a suggestion on how I should implement this for testcontainers-dotnet ?