Add default logger implementation

[HofmeisterAn]

What does this PR do?

Adds and assigns a default logger implementation to TestcontainersSettings.Logger. This approach does not cover all test environments. We simply forward messages to stdout, stderr and Debug. In most cases, they will pop up somewhere (the dotnet CLI won't show the messages though). Developers can always set their own implementation if necessary.

Why is it important?

Writing to console in .NET tests goes usually through the test framework and is something the developer needs to take care of. Nevertheless, writing default information to the console is super helpful for developers that are using Testcontainers and is pretty common in other languages. It is also a bit weird that everyone has to take care of it. As a 3rd party library we do not know which test framework a developer is using. Nor do we know anything about the instance to log to.

Related issues

• Closes Get information about the Testcontainers environment #603

Follow-ups

• I will add the Docker host information etc. as follow-up
• Test framework specific modules that hook up a logger implementation.
• Custom test adapter implementation (Console output for any VSTest test framework microsoft/vstest#4125).

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